Made from recycled plastic bottles, this duo fits perfectly on the bottom of our Lunch Kits, Snack Packs, and in the pocket or bottom of our Insulated Lunch Sacks. Pop both in the freezer, place in your lunch sacks, and it will keep your lunch cold for hours. Free of BPA, phthalates, PVC and lead! Cover is made from 100% non-toxic RECYCLED PET #1 plastic bottles. Gel pack is made of a non-toxic sodium polymer.