Lightweight and Durable - Piscifun Cooler Backpack cover is made from high density Nylon fabric, which greatly increases the strength while reducing the weight. In the meantime, two side compression strap also contributes to increased durability by reducing the pressure on zippers. Leakproof and Easy to Clean - The High Frequency Heat Welded technology gives no leaking chance for any liquid even the vapor. The antibiotic liner is extremely soft and flexible, which can effectively resist odor and avoid mold production. Besides, it is easy to clean after use. 18 Hours Cold - 4-Layer Back Design enhances the overall strength and thermal insulation effect. High quality thicken PEVA hot-pressed liner keeps your food and drinks for 18 hours temperature below 50 ??with Freeze Packs?. Comfortable and Ergonomic - Thicker padded back with ergonomic breathable design, paired with adjustable, breathable and padded shoulder straps, give you better comfort. You can use it as your day pack or simply a soft cooler. The pack is perfect for lunch, picnic, fishing, hiking, camping, beach, park, day trip! User-Friendly Design - The cooler bag comes with an easy access to the built-in bottle opener. The retractable drawstring on the surface allows you to carry your clothes easily. Two extra zippered pockets and two side mesh pockets help you keep other stuff dry, and save plenty of room for main compartment. WARNING: On the basis of Proposition 65 of California Law, this product may expose you to the chemicals such as lead which is known to the State of California can cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov