I used a granny bag as a lunch bag. The inner fabric uses a sheet for heat and cold insulation.
It is also possible to enlarge or reduce the size introduced in this video and make it in your favorite size.

[Introduction of materials] Includes Amazon.co.jp associates.
Outer fabric Oxford fabric (gray cherry)
https://amzn.to/3BCKmm0
Adhesive interlining Presion interlining Hari Hari Raku Hari
Inner fabric Thermal insulation sheet (fabric) *This sheet can be washed with water
https://amzn.to/3r3Iiie
Inside cover (front side) sheeting fabric (navy dot)
Adhesive core AM-W3
https://amzn.to/3UxHXSl
Inside cover (inside) heat and cold insulation sheet (fabric)
Polyester tape 3 cm wide
(*Handles for bags, etc.) Acrylic tape can also be used.
Fastener: Coil chain fastener (small) Seria

[Introduction of tools] Includes Amazon.co.jp associates.
Sewline mechanical pencil for cloth
https://amzn.to/3cYXQQS

Thread cutting scissors: CLOVER CUTWORK115
https://amzn.to/3Qw52l0

#handmade
#diy
#granny