I usually bring a bag or two when I go grocery shopping, but once in a while, I forget.
We used to have so many plastic bags from grocery stores (but they will be used as garbage bag) and taking space from our tiny home.
This is something my mother taught me - how to fold and store plastic bag. I guess it relates to Origami (paper folding) culture, but it does save space!
Please follow the presentation slides. It's easier to understand. :-)