If you've ever had something shipped to you that needed to stay frozen or icy cold, it probably came with frozen gel packs. The blue liquid "gel" inside the packs can be kept frozen, and the packs can be reused over and over again in a cooler for your picnic, for example. But if you want to get rid of the packs, go ahead and let them thaw. Open the packets with scissors, and let the liquid go down the drain. It's completely nontoxic. The empty plastic pouches can be recycled with plastic shopping bags at grocery stores.