I make eco-bags from Japanese Furoshiki fabric.

Kawamichi Shoten’s eco-bag has enough digth for putting into the big lunch box of the convenience store. And it has rubber and simple carabiner. you can use rubber for fold the bag to small, and then simple carabiner to hook on the belt loop of jeans etc.
I attached them and make it easy to use.

If the rubber stretches, it can be replaced, and if you don’t need a simple carabiner, you can remove it.

This time, I made 3 new pieces of them by remake of Furoshiki fabric.