Free samples are available. The reusable lunch bag is made of thickened waterproof aluminum foil, with three layers of insulation, excellent thermal insulation, strength and durability, and easy to clean. The picnic bag can keep your food cool or warm for up to 3-4 hours. Make your food fresh and delicious. The lunch bag with soft handle is leak proof and light. It can hold all bento boxes, fruits, snacks, drinks and other items. The front pocket can hold mobile phones and other personal items.