I realized that I was spending way too much money on plastic bags for storing or wrapping things when I was getting them for free with the food I was buying.
So now I wash my bread sacks or ziploc bags, hang them to dry and use them again. There is a limit as to how many times you can use a bag, but you know it when you reach it. I also never re-use a bag that I used for meat. They are just too hard to get really clean.
And to think I used to laugh at my grandma for washing pieces of foil and using them again.