Developed to keep it cool, the cooler backpack is made of 5 layer materials. Designed with Scratch Ripstop Snowflake Cloth + Waterproof PU Coating + High-density 8mm Pearl cotton + Aluminum foil + Leakproof -pressing TPU Liner work together to make sure anti-leaking and keep food /Cold. Our leakproof cooler keep it cool for 36 hours. LEAKPROOF BACKPACK COOLER: Our portable cooler is leakproof and waterproof. The hard liner and waterproof zippers keep your drinks and food safely stored, even when the backpack is tossed around MULTIPLE POCKETS: Our beach backpack's front pocket is perfect for phone, wallet, and keys, while the dual wine bottle side pockets come with built in covers. EASY TO CARRY: Traditional ice chests and coolers are bulky and difficult to carry. Our portable cooler bag has padded adjustable straps and a carrying handle that's easy to travel with, comfy to wear VERSATILE USE: Use for any occasion, perfect as a beer cooler, beach cooler bag, travel cooler, lunch backpack for men, boat cooler, food backpack, grocery backpack, and picnic insulated backpack Color: Black Material: Oxford cloth Package Contents: 1 x Thermal Bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.