The Drawstring Cooler bag has heat-sealed PEVA insulation. Drawstring backpack with insulated inner for carrying items that need to be kept cold. Outer slip pocket for keeping small accessory items for quick access. This insulated backpack is made of sturdy polyester material with insulated inner. Reinforced corners with metal grommets for long-lasting durability. The drawstring backpack is wonderful for basketball, gym, sport, yoga, dance, travel, camping, work, and more