I don't reuse plastic zipper bags. I have a fear of cross contamination. So I use freezer box systems. For recycling grocery, bread, or other plastic bags... I cut them into yarn and knit or crochet them into rugs or market bags. I have made purses, and my current project is to make crochet basket style pots for my garden. Some will hold herbs some will perhaps be hung for some up side down tomatoes. I have also heat fused them together using an old iron and made a lunch sack for myself. Though I do not recomend that to anyone for the fumes stink and can't possibly be good for you or the enviornment.