These cute cold packs work great, and are easy to clean. Wonderful for lunches that don't fit in my daughter's bento jar.
We keep owls and penguins in our freezer, to use as needed. We wash'em off in the sink, and let them air dry. Also good for boo-boos and bonks, when wrapped in a kitchen towel!
Fit & Fresh Cool Coolers Slim Character Shaped Lunch Ice Packs, Multicolored – Set of 4 via Amazon