I have seen instructions elsewhere that say the 80% rule is for a completely empty canister, In other words the manufacturers only fill to 80% when new to allow for expansion should the canister be exposed to heat in transport or storeage. It is wise not to push the limit. Your rule of 80% of original fill should certainly be safe. Best wishes.
That gizzmo in America is called GWorks Lindel valve, something I've been using from the get-go. Thanks to the valve, I always start out with a full 110gr of gas inside a small canister. BANG - I like your sense of humor. Warm Regards from Reno, Nevada U.S.A.
110gram!?!?! ...and never problem? Interesting!!! I'm maybe little bit to careful!? Hahaha... tha bang. 🤣 I didn't know if people would like that or not. 😀 Thanks anyway. /Matti
@@JOKKMOKKGUIDERNA The MSR small canisters have an empty weight of 101g and net gas content of 110g (total weight when full 211g). Primus has similar empty weight but only 100g of gas (around 200g when full). So if you fill to 160g, you are about 60% of the original fill of the canister. I think everybody should be careful and actually know what they are doing as you said so you make your own judgements and also check the facts and numbers on your scales, do not just trust random guys (as me for example) in internet 🙂
Hello Matti, thank you for your nice Videos! I really enjoy them! I never think about refilling my Gascanisters, but I will try it. Greetings from Germany, Christian.
Thanks! I think you will save some money and also save some environment. 😀 Most of the gas we buy in Sweden is from South Korea... transpoted over the whole planet... Crazy... /Matti
Hej Matti! We just binge-watched your and Stina's channel and as we saw this video, we thought we should try it ourselves. When we received our adapter, we followed your step-by-step instruction and succeeded! Great tip! ATB André & Julia (subscribers 🙂)
Thank you very much for your kind comment guys :)It ended up in the spam filter though, and if I approve it, I will most likely not be able to find the comment.
Hej, Matti! Thank you for the great videos! This one insipres me to buy refill adapter, because it's a common traveller's problem: half-empty gas canisters, which refuses to burn in low temperatures outside. An once again, thanks for the safety instructions for refilling process. It was new information for me. But i have one interesting question: why not you using pressure lowering button on refill adapter? This button allows you not to warm up outgoing canister, and not to cool down incoming canister. I pressing this button 3 or 4 times during refill process of 230g canister and all canisters (full and empry) are the same temperatures. P.S. You need to insert disclamer at the beginning: "Please, finish drinking tea or coffe before viewing this video clip" 😀
Does it exist this pressure lowering system for this kind of gas tube??? I have never heard about anything like that before. 😀 It sounds like a great idea! /Matti
@@JOKKMOKKGUIDERNA Yes, it exists :) I have the same gas tube "campingmoon" as yours. Pause your video at 06:22. There you can see round button. Connect two gas canisters to refill adapter and start refilling. When it stops pissing, turn off valve, then press this round button for a 5-7 seconds and you will hear that bottom canister is depressurising. Then you can open valve and continue refilling process. And if you examine refill adapter, you will notice a small hole wiсh titled "ventilation" on the one of refill adaptor's side. This hole releases pressure from "IN" gas canister while button pressed.
Yes you can vent the canister to cool it, but in that process you waste enough gas to heat a cup of water for tea.... Better to chill the canister in a freezer if you can.
I've been filling my bottles for 20+ years. I filled 47kg bottles of winter auto gas. It 70 30 mix. I decanted into 907 904 901 gaz bottles. A 100 gram of gas cost 1.5 pence uk. About 65 100g cans for a £1.
@@JOKKMOKKGUIDERNA Matti I've never had one explode. I have had a few where the gas seal has not closed properly. Though it can happen with a new one. The threads are easy stripped with lots of extra refills. If you keep the 80% rule you will never go wrong.
2 роки тому
Where can I buy adapter to fill from a P11 bottle into a small outdoor gas bottle.
@ Gases in heavy steel bottles have more propane, even 100%. It has much higher gas pressure than those gas mixes (butane, isobutane etc.) in light aluminium canisters. Positive side of high pressure propane is it works even in very cold. But if you refill a light canister with it it will explode when heated, for example if left in sunshine or possibly even in room temperature. So don't do it. Gases are not same and they need different containers.
It’s admirable to be thirify , I do this type of transfer with propane. The two safety measures I use are to wear gloves so if there is a mishap I don’t freeze my fingers and I work in the middle of my yard away from buildings so should a problem occur nothing is damaged.
I agree with the idea of not doing this inside the house. I usually are out in our garage and totally outside is safer. ...but I have never heard someone who has an explosion. Have you heard anything? /Matti
I've never tried it this way but I do fill my canisters from the Aerosol type can with a little gizmo again from Amazon. But I think I'll get one of these as I have a number of the larger oversized canisters that tbh never get used as they are far to big. And I also use the Jetboil Jatgauge
You can refill the old cannisters to the weight they were made. They dont go Bang! The concave shape of the bottom of the can is so that should there be a rise in pressure inside it will Pop out! They are pretty Tuff 👍
Hi Matti, I have a 100g PRIMUS, I bought the small transfer system before watching this video, when I went to test it to fill it I read the small letters printed on the canister where it says: CANNOT BE RECHARGED... I'm perplexed... also when screwing the transfer on the IN side of the PRIMUS canister there seems to be some resistance... as if it wouldn't let it in... on other canisters of another brand it seems that this doesn't happen... on your 100g PRIMUS is there this resistance when screwing it in? Do your PRIMUS canisters have a sign not to recharge? Thanks for the video.
Yes… it’s written on the tube that you shouldn’t refill it. I don’t really know what you mean by ‘some resistance’… Try to change places on the tubes… Is it still resistance? Try to open the screw and see if some gas goes to the other tube. I don’t think anything bad will happen. /Matti
@@JOKKMOKKGUIDERNA It seems that the pin on the side where IN is written is thinner than on the side where OUT is written, when I try to attach the small transfer system on the IN side to the PRIMUS canister it seems that it doesn't want to "go in" on the OUT side There are no problems screwing it in, the pin goes in smoothly...
I use quite hot water on the canister because that is the only way you can empty it completely, and that is what I bought this device for, emptying my half full canisters that I never take with me on a trip anyways. I don't think heating it is dangerous when there is very little gas in it, anyway it wont explode and burn without fire present so...
I’ve done this a couple of times, still here.. although, it is advisable to do it outside or at least by an open window. Please take care of yourself at least untill I have the money to come to one of your tours! 🤭 Hehe, just kidding of course, stay great! 🙋♀️
När jag fick betala lika mycket för en 100 gram tub som för en 230gram tub på en friluftsbutik började jag fylla mina egna, billigt och lätt plus att man blir av med alla skvättar.
Its better to take the cap off the canister before putting in the freezer. Later can be difficult. I use butane canister to refill my 100g one. With different adaptor. Works well for summer, cheaper too.
I always wanted to fill the smaler 100 or 110 canisters obviously to save money as the smaller canister are way more difficult to obtain in shops. so, delivery costs are also added to the purchase of smaler canisters making them so expensive and filling them is a desirable option just wish there was a safer way to do this, and less risk and work.
These canister stoves like Jet boil are...one expensive. Two, environmentally unsound. Third, bulky and requiring being able to find the canisters if you are out in the middle of no where. My MSR can burn gasoline if needed.
Lite Professor Balthazar känsla där... men smart idé. Undrar om det funkar med typ en P6:a som källa... fast man kanske inte får göra sånt utan tillstånd? p.s. Hade Subtitles på för jag sitter på jobbet... Dom textar "nature guide and dog musher together with my partner Steve"... fick mig att skratta till lite.
Hahaaaa... Steve. 😀 Det är olika gasblandning i en p6a och i dessa engångs tuber. Olika gas = olika tryck. Här måste man ha koll på de olika sakerna så.det inte blir fel... Jag skulle inte gjort det. /Matti
Incorrect. You save money by transferring butane and propane from their specialized tanks directly into the camp stove cannister. You can also pump up the propane percentage a bit to greatly enhance cold weather performance. I perform these transfers and I winter camp well below freezing and I enjoy huge money savings and much better cold weather performance.
I totally agree... I think you missunderstand this video. I have 5 half empty canisters. Then I refill one with the other half empty once. 😀 The whole idea is to avoid 5 halfemty canisters. 😀 /Matti
To add to JOKKMOKKGUIDERNA - Matti & Stina comment, the 110 gram canisters are much more expensive that say a 250 gram. The smaller 110 gram are for me, easier to pack and weigh less so I prefer using those. So I use a bigger bottle to refill the smaller one, it's just less costly than buying a small new bottle.
In a lot of countries doing this is illegal. In the USA it is a felony... you can spend up to 5 years in federal prison and/or up to a 500,000$ fine if you transport a refilled canister on a highway), you need to be licensed to refill gas canisters and the canisters have to be legal to fill. Plus it is very dangerous. Those adaptors don't have a pressure gauge or bleed valve, and it is possible to over pressurize them (even if you use a scale) causing them to rupture even explode. These canisters are not designed to be reused, and just because it had say 400g of isobutane in it the first time does not mean it can support any further fillings at that amount. The metal flexes each time it goes from full to empty and will cause an unknown amount of metal fatigue, and metal fatigue is largely invisible. Also the valve can leak, as it is not designed to be more than a handful of times. It is not a question of if a refilled canister will explode, but when it will. Heck even the unrefilled ones sometimes explode too. I detest gas canisters and refuse to use them, as they are causing massive problems. People illegally throw millions of them into the garbage in campsites and parks. They are super dangerous to garbage collectors and processors, as the canisters detonate when crushed, even is supposedly empty. They are clogging up national parks as people toss them into the bush; I find them all over the place in the wilderness. Plus few places recycle them (They get treated as hazardous waste and buried in barrels). California is planning on banning them outright due to all the problems they have had with them. So I use a Trangia alcohol stove, and in the winter I use a multi-fuel stove, which I can easily refuel. My lantern is either battery or UCO candle lantern.
...seriously!?!? Prison? In Europe we always hear about US as the place of freedom. 😉 I agree... aluminium 'gets tired ' when you flex it... and also about all canisters all over the place. BUT... imagine if we had a refilling system. You buy a little bit better gastube (new system with tubes made for refulling) and then could refill it at a gas station. /Matti
I also have been using canister stoves less and less. I thill think they are the most convenient cook system, but I don't like the gas roar nor the canister themselves. My choice at the moment is the BCB firedragon fold stove plus hand sanitizer. But realistically, for longer hikes, carrying large amounts of alcohol doesn't make sense.
You can buy a simple metal device that will safely pierce an empty canister and turn it into safe metal recycling. It looks a little like an old can opener. People need educating.
Not gonna lie that jump scare got me😂. Thanks for the video about the device.
Hahahahaaa... Then I succeed! 😀
/Matti
This is the best gas refill video I have seen thank you. Having watched a few I now feel safe to try. Shouting BANG! you got me! :D
Great little video, did jump when you went . . ."BANG" ! . . .
Hahahaa... Nice to hearing!
😀
/Matti
Great idea, I must consider this. The idea to use the big one to fill smaller ones would be perfect
I have seen instructions elsewhere that say the 80% rule is for a completely empty canister, In other words the manufacturers only fill to 80% when new to allow for expansion should the canister be exposed to heat in transport or storeage. It is wise not to push the limit. Your rule of 80% of original fill should certainly be safe. Best wishes.
Thanks!
If I understand you correctly... already 230gr gas in a full tube is 80% of what the canister can handle in a safe way!?
/Matti
@@JOKKMOKKGUIDERNA Yes, that is the way i understand it.
to Clearify, the 230 g of gas is safe as a refill level Not safe to put more than 230 total into that canister.
That gizzmo in America is called GWorks Lindel valve, something I've been using from the get-go. Thanks to the valve, I always start out with a full 110gr of gas inside a small canister.
BANG - I like your sense of humor.
Warm Regards from Reno, Nevada U.S.A.
110gram!?!?! ...and never problem? Interesting!!!
I'm maybe little bit to careful!?
Hahaha... tha bang. 🤣
I didn't know if people would like that or not. 😀
Thanks anyway.
/Matti
@@JOKKMOKKGUIDERNA The MSR small canisters have an empty weight of 101g and net gas content of 110g (total weight when full 211g). Primus has similar empty weight but only 100g of gas (around 200g when full). So if you fill to 160g, you are about 60% of the original fill of the canister.
I think everybody should be careful and actually know what they are doing as you said so you make your own judgements and also check the facts and numbers on your scales, do not just trust random guys (as me for example) in internet 🙂
Hello Matti,
thank you for your nice Videos! I really enjoy them!
I never think about refilling my Gascanisters, but I will try it.
Greetings from Germany, Christian.
Thanks!
I think you will save some money and also save some environment.
😀
Most of the gas we buy in Sweden is from South Korea... transpoted over the whole planet... Crazy...
/Matti
Hej Matti! We just binge-watched your and Stina's channel and as we saw this video, we thought we should try it ourselves.
When we received our adapter, we followed your step-by-step instruction and succeeded! Great tip!
ATB André & Julia (subscribers 🙂)
Thank you! Happy to hear you binge-watched our videos and that you succeeded with the gas refilling👍. /Stina & Matti
Great stuff. I heard somewhere that the bottom "dent" will pop out when overpressured. Before they explode in a fireball, perhaps 😁😏
There will not be a fireball as long as you’re not smoking at the same time… So my advice… don’t smoke while you’re doing this!!!
🤣
/Matti
Thank you very much for your kind comment guys :)It ended up in the spam filter though, and if I approve it, I will most likely not be able to find the comment.
Thanks for your good content and take care over there... /Matti & Stina
Good humour. Refer to this video regularly
That exact same attachment works perfectly for me.
Definitely going to get one of these.
Worked after putting into the freezer thanks
Hej, Matti! Thank you for the great videos! This one insipres me to buy refill adapter, because it's a common traveller's problem: half-empty gas canisters, which refuses to burn in low temperatures outside. An once again, thanks for the safety instructions for refilling process. It was new information for me.
But i have one interesting question: why not you using pressure lowering button on refill adapter? This button allows you not to warm up outgoing canister, and not to cool down incoming canister. I pressing this button 3 or 4 times during refill process of 230g canister and all canisters (full and empry) are the same temperatures.
P.S. You need to insert disclamer at the beginning: "Please, finish drinking tea or coffe before viewing this video clip" 😀
Does it exist this pressure lowering system for this kind of gas tube??? I have never heard about anything like that before. 😀 It sounds like a great idea! /Matti
@@JOKKMOKKGUIDERNA
Yes, it exists :) I have the same gas tube "campingmoon" as yours. Pause your video at 06:22. There you can see round button. Connect two gas canisters to refill adapter and start refilling. When it stops pissing, turn off valve, then press this round button for a 5-7 seconds and you will hear that bottom canister is depressurising. Then you can open valve and continue refilling process.
And if you examine refill adapter, you will notice a small hole wiсh titled "ventilation" on the one of refill adaptor's side. This hole releases pressure from "IN" gas canister while button pressed.
Yes you can vent the canister to cool it, but in that process you waste enough gas to heat a cup of water for tea.... Better to chill the canister in a freezer if you can.
Can you refill from propane tank (BBQ tank, to butane tanks (tanks shown in your video?)
Absolute NO… That’s two different kinds of gas and they have different pressures.
/Matti
@@JOKKMOKKGUIDERNA ahh! Strange that they sell an adapter to refill from propane gas tanks 👀🙈
😂 you got me on the BOOM 😂
🤣
I've been filling my bottles for 20+ years. I filled 47kg bottles of winter auto gas. It 70 30 mix. I decanted into 907 904 901 gaz bottles. A 100 gram of gas cost 1.5 pence uk. About 65 100g cans for a £1.
Interesting... Have you ever had a canister that have explode, start leaking or breaking down because you have refilled it?
/Matti
@@JOKKMOKKGUIDERNA Matti I've never had one explode. I have had a few where the gas seal has not closed properly. Though it can happen with a new one. The threads are easy stripped with lots of extra refills. If you keep the 80% rule you will never go wrong.
Where can I buy adapter to fill from a P11 bottle into a small outdoor gas bottle.
@ Gases in heavy steel bottles have more propane, even 100%. It has much higher gas pressure than those gas mixes (butane, isobutane etc.) in light aluminium canisters. Positive side of high pressure propane is it works even in very cold. But if you refill a light canister with it it will explode when heated, for example if left in sunshine or possibly even in room temperature.
So don't do it. Gases are not same and they need different containers.
@@bekanavisn't this simply avoided by using butane instead. Large bottles of butane (pure) are widely available.
It’s admirable to be thirify , I do this type of transfer with propane. The two safety measures I use are to wear gloves so if there is a mishap I don’t freeze my fingers and I work in the middle of my yard away from buildings so should a problem occur nothing is damaged.
I agree with the idea of not doing this inside the house. I usually are out in our garage and totally outside is safer.
...but I have never heard someone who has an explosion. Have you heard anything?
/Matti
I've never tried it this way but I do fill my canisters from the Aerosol type can with a little gizmo again from Amazon. But I think I'll get one of these as I have a number of the larger oversized canisters that tbh never get used as they are far to big. And I also use the Jetboil Jatgauge
Great! Do the same. But not warming. Only cooling the recieving canister. And also have a careful look at the recieving one for even small damages!
I think that's a good idea because when I put it VERY hot water there was some interesting sound from the gas in the hot canister... 😉
/Matti
BTW, love your videos!
Longing for Sunday morning!!!
Thanks, just ordered one👍👍🇬🇧🇬🇧
I think you will be happy with this small useful thing. 😀
/Matti
Thanks for the video! Is the freezer/ warm water crucial?
You can refill the old cannisters to the weight they were made. They dont go Bang! The concave shape of the bottom of the can is so that should there be a rise in pressure inside it will Pop out! They are pretty Tuff 👍
Hi Matti, I have a 100g PRIMUS, I bought the small transfer system before watching this video, when I went to test it to fill it I read the small letters printed on the canister where it says: CANNOT BE RECHARGED... I'm perplexed... also when screwing the transfer on the IN side of the PRIMUS canister there seems to be some resistance... as if it wouldn't let it in... on other canisters of another brand it seems that this doesn't happen... on your 100g PRIMUS is there this resistance when screwing it in? Do your PRIMUS canisters have a sign not to recharge? Thanks for the video.
Yes… it’s written on the tube that you shouldn’t refill it. I don’t really know what you mean by ‘some resistance’… Try to change places on the tubes… Is it still resistance?
Try to open the screw and see if some gas goes to the other tube.
I don’t think anything bad will happen.
/Matti
@@JOKKMOKKGUIDERNA It seems that the pin on the side where IN is written is thinner than on the side where OUT is written, when I try to attach the small transfer system on the IN side to the PRIMUS canister it seems that it doesn't want to "go in" on the OUT side There are no problems screwing it in, the pin goes in smoothly...
I use quite hot water on the canister because that is the only way you can empty it completely, and that is what I bought this device for, emptying my half full canisters that I never take with me on a trip anyways. I don't think heating it is dangerous when there is very little gas in it, anyway it wont explode and burn without fire present so...
I agree... and I'm happy to hear that you have done this also.
😀
/Matti
I’ve done this a couple of times, still here.. although, it is advisable to do it outside or at least by an open window.
Please take care of yourself at least untill I have the money to come to one of your tours! 🤭 Hehe, just kidding of course, stay great! 🙋♀️
I think it's a good idea to make this work outside... 😉
Welcome to the North!
/Matti
När jag fick betala lika mycket för en 100 gram tub som för en 230gram tub på en friluftsbutik började jag fylla mina egna, billigt och lätt plus att man blir av med alla skvättar.
Har du koll på hur.många gånger du har kunnat återfylla en tub? /Matti
Its better to take the cap off the canister before putting in the freezer. Later can be difficult. I use butane canister to refill my 100g one. With different adaptor. Works well for summer, cheaper too.
It's a good idea to take of the cap before it getsfrozen!
/Matti
6:44 damn i jumped out of my chair 🤣 screw you
I clicked on the link and there are several which one is the one you are using?
I like doing this, it saves me having two dozen half full canisters.
That's the biggest advantage!!!
/Matti
Wow! Didn't know it was possible!
🙂👍
I always wanted to fill the smaler 100 or 110 canisters obviously to save money as the smaller canister are way more difficult to obtain in shops. so, delivery costs are also added to the purchase of smaler canisters making them so expensive and filling them is a desirable option just wish there was a safer way to do this, and less risk and work.
That was scary, thanks :D
🤣 /Matti
These canister stoves like Jet boil are...one expensive. Two, environmentally unsound. Third, bulky and requiring being able to find the canisters if you are out in the middle of no where. My MSR can burn gasoline if needed.
I agree about the environmental unsound. 😞
/Matti
Using a crunch it device. The canisters can be recycled.
Lite Professor Balthazar känsla där... men smart idé. Undrar om det funkar med typ en P6:a som källa... fast man kanske inte får göra sånt utan tillstånd?
p.s. Hade Subtitles på för jag sitter på jobbet... Dom textar "nature guide and dog musher together with my partner Steve"... fick mig att skratta till lite.
Hahaaaa... Steve. 😀
Det är olika gasblandning i en p6a och i dessa engångs tuber. Olika gas = olika tryck. Här måste man ha koll på de olika sakerna så.det inte blir fel... Jag skulle inte gjort det.
/Matti
Веселый товарищ, шутник!
Satte kaffet i halsen.. Smart pryl!
Hahahaaa... då är jag nöjd!!! /Matti
Does anyone know why they have the 80% rule?
You got me!! Boom!
Wait........If it comes from the factory with 100gm of fuel in it, why can't I put 100gm back into it?
Hahaha!!! Don't try this at home😅 I gotta buy one of those🔥🔥 thank you Matti
Living on the edge...
🤣
/Matti
You made me jump 🤣
If you refill the same canister with the same canister. There is no danger at all.
Incorrect. You save money by transferring butane and propane from their specialized tanks directly into the camp stove cannister. You can also pump up the propane percentage a bit to greatly enhance cold weather performance. I perform these transfers and I winter camp well below freezing and I enjoy huge money savings and much better cold weather performance.
Tidy
Coolt, måste skaffa!
Du har en länk här nere. Det är en riktigt bra liten grunka. 😀
/Matti
👏👌🇳🇴
Or you can just _zero your scale_ with an empty can and refill to 80 grams.
Makes no sense why you would refill an empty canister with a full canister of the same make. Why wouldn't you just buy a new canister?
I totally agree...
I think you missunderstand this video. I have 5 half empty canisters. Then I refill one with the other half empty once. 😀
The whole idea is to avoid 5 halfemty canisters.
😀
/Matti
To add to JOKKMOKKGUIDERNA - Matti & Stina comment, the 110 gram canisters are much more expensive that say a 250 gram. The smaller 110 gram are for me, easier to pack and weigh less so I prefer using those. So I use a bigger bottle to refill the smaller one, it's just less costly than buying a small new bottle.
In a lot of countries doing this is illegal. In the USA it is a felony... you can spend up to 5 years in federal prison and/or up to a 500,000$ fine if you transport a refilled canister on a highway), you need to be licensed to refill gas canisters and the canisters have to be legal to fill. Plus it is very dangerous.
Those adaptors don't have a pressure gauge or bleed valve, and it is possible to over pressurize them (even if you use a scale) causing them to rupture even explode. These canisters are not designed to be reused, and just because it had say 400g of isobutane in it the first time does not mean it can support any further fillings at that amount. The metal flexes each time it goes from full to empty and will cause an unknown amount of metal fatigue, and metal fatigue is largely invisible. Also the valve can leak, as it is not designed to be more than a handful of times. It is not a question of if a refilled canister will explode, but when it will. Heck even the unrefilled ones sometimes explode too.
I detest gas canisters and refuse to use them, as they are causing massive problems. People illegally throw millions of them into the garbage in campsites and parks. They are super dangerous to garbage collectors and processors, as the canisters detonate when crushed, even is supposedly empty. They are clogging up national parks as people toss them into the bush; I find them all over the place in the wilderness. Plus few places recycle them (They get treated as hazardous waste and buried in barrels). California is planning on banning them outright due to all the problems they have had with them.
So I use a Trangia alcohol stove, and in the winter I use a multi-fuel stove, which I can easily refuel. My lantern is either battery or UCO candle lantern.
...seriously!?!? Prison?
In Europe we always hear about US as the place of freedom. 😉
I agree... aluminium 'gets tired ' when you flex it... and also about all canisters all over the place.
BUT... imagine if we had a refilling system. You buy a little bit better gastube (new system with tubes made for refulling) and then could refill it at a gas station.
/Matti
I suspect you could find something wrong with a rotten egg.
My transfer valve DOES HAVE a bleeder valve.
I also have been using canister stoves less and less. I thill think they are the most convenient cook system, but I don't like the gas roar nor the canister themselves.
My choice at the moment is the BCB firedragon fold stove plus hand sanitizer.
But realistically, for longer hikes, carrying large amounts of alcohol doesn't make sense.
You can buy a simple metal device that will safely pierce an empty canister and turn it into safe metal recycling. It looks a little like an old can opener. People need educating.
I am also a milk drinker