-I've made a number of them. I like canvas and think anything that weight would work.
-Some are insulated for dairy, frozen, deli
-For meat I use insulated. And I put the package into a flimsy plastic bag. But, a grocery bag could be lined with a removable heavier plastic so it can be cleaned
-larger bag for fruit/veg
Pre-portioned chips are packed in a heavy plastic bag, we use for vegetables