Last week I talked about using zip bags for packing daily changes of clothing.
Another good use for these little bags is when picnicing.
I saturate several wash cloths, fold into quarters, and pop each into a sandwich size baggie. Then I drop them into the cooler.
They are great for wiping sticky hands and faces.
If someone falls down, that frozen washcloth makes a great mini-ice pack, flexible, and not too lumpy if you need to lie on it (for bumps on the head).
And they are re-usable, unlike packaged wipes. After a few hours, the cooler ice will have melted, so there is some water in the bottom. Rinse out the washcloth in the cool water, and reuse.
I keep my oldest raggediest washcloths for this purpose.
And you can rinse out the baggies, let them dry, and reuse--just be sure you rinse well, because soapy residue, although it may not be visible, will certainly affect the taste of your sandwiches.
Works for me.