ENHANCED HEAT/COLD PRESERVATION: The cooler compartment design holds and keeps items fresh for 6-12 hours. A double-layer method of insulation keeps the compartment hot or cold. The outside layer is water resistant, which helps protect the compartment from the weather, while the inner layer is constructed of high density material and is entirely lined with a leak-proof substance. LEAKPROOF & WATERPROOFWithout danger of leakage, our soft lunch bag successfully maintains your beverages at the right temperature. Because our insulated backpacks include a leak-proof hard liner and a waterproof zipper, you can securely load them with ice, beer cans, and soda cans and carry them around without getting soiled. LARGE CAPACITY: The lunch bag has a maximum capacity of 20L and a spacious interior that can store up to a combination of drinks, meals and snacks. It is useful for a wide range of uses, including catering to an outside picnic for your family, arranging lunch and snacks for your children, and carrying cold drinks for outdoor sports. LIGHTWEIGHT & PORTABLE: Traditional coolers are large, heavy, and difficult to transport. Our backpack cooler has cushioned adjustable shoulder straps and handles for simple visits to the beach, hiking, or taking a road trip. It's a really excellent size which is fairly large, but yet manageable. It's beautifully cushioned all around, so it's comfy to carry against your back. WIDE RANGE OF USES: Cooler backpack is ideal for lunch at work, hiking, camping, fishing, BBQ & beach party, road trip, travel, hunting, trail, cycling, and other outdoor activities. It is also a great present for an anniversary, holiday, or festival such as Christmas, Thanksgiving Day, Father's Day, Mother's Day, or a birthday.