More uses:
In addition to groceries, I always have one on hand for collecting herbs in the field, shells at the beach or other unexpected additions to the trip. Our family of 3 boys and 3 girls uses two of these bags for holding wet swimming gear, each group going to the changing room with their own bag.
When I was still selling animals, I used these bags to hold the gift packages I sent home with buyers. Everyone loved this additional detail!