You could pack silverware or plastic silverware in them for your picnic basket to keep them from getting broken.
Once a roll of trash bags gets low, or you can use it for the smaller wastebasket rolls, you can place them in there with one sticking out and it works like the old baby wipe containers and won't unravel.
We have also used them to collect dried flower buds at the end of the summer to replant the next year.
You can store half-baked cookies in the freezer, then finish baking them a few at a time. This has been done with Pringle cans but could also be done with tennis ball cans.
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