Whether youre headed back to work, school, or just want to escape the house for a picnic, these Cool Coolers Slim Ice Packs are perfectly sized for all types of bags. Pack them in lunch bags, coolers, beach bags, picnic baskets and more! These ice packs are slim and compact, yet powerful. They are perfect for tight spaces or stacking together for even greater cooling power. Included in this set are 4 multicolored ice packs (1 gray, 1 blue, 1 green and 1 red). These reusable ice packs are designed to last long so you can head out knowing that what you pack will stay cool and fresh until you are ready to eat. For maximum cooling power, freeze the ice packs the night before use.