How to make a cold bag (lunch box)

The lining is an aluminum sheet.
The gusset is also wide, so it's convenient to put in a lunch box.
Why don't you make an ice pack before the hot season comes?
"Finished dimensions"
22 cm x 30 cm
Machi 13cm
"material"
Outer material 33 cm x 18 cm 2 sheets
Separate cloth 33 cm x 25 cm 1 sheet
Handle 35 cm x 10 cm 2 sheets
Adhesive interlining to be attached to the handle 35 cm x 10 cm 2 sheets
Cold insulation aluminum sheet (for handicraft)
33 cm x 57 cm 1 sheet
Fastener 30 cm 1
* 35 cm (including seam allowance) for fasteners that are cut and used
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/ @monsewing