Bag-on-Valve (BOV) Aerosol Technology | TUNAP explains.

Bag-On-Valve: TUNAP stands for intelligent product concepts and sustainable developments. Our aim is always to deliver the best quality and at the same time to meet the highest standards in terms of health and environmental compatibility. How we implement these guiding principles in specific product concepts can be illustrated very well by the Bag-on-Valve (BOV) aerosol technology.
With classic spray dispenser systems, the product and the propellant are spatially located together in the can. This is not the case with Bag-on-Valve aerosols: Here the product and the propellant are spatially separated from one another.
The active ingredient is contained in a flexible, sealed aluminium bag that is connected to the valve. The compressed propellant is located outside of it, in the remaining space between the bag and the inner can wall.
When the spray head is pressed, the product is applied in its pure form - and not together with the propellant, as is the case with conventional aerosols.

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It helps a lot, thank you for your video.👍

[@PrinceGupta-vl8zd]

What material is the bag made up of?