A couple of years ago, my mom gave me a fun tip for cooler packs that are perfect for picnics and summer music festivals. She had found an article on Pinterest that recommended saturating a kitchen sponge, putting it in a small Ziploc bag, and then freeze it. Once frozen, it can be tossed into lunch boxes and coolers without the risk of getting the contents wet! My friends and I tried it out at Soulfest in Gilford, New Hampshire and the homemade freezer packs worked perfectly. Click here to see the original post.