TUGUAN 30L Cooler Backpack 36 Cans Insulated Cool Bag Rucksack Leak Proof Picnic Backpack Men for Lunch Work Thermal Rucksack Women for Travel Camping BeachInsulated & Leak Proof: Our cooler backpack is lined with thickened waterproof material seamlessly hot pressed, which has leak proof properties. The insulated backpack cooler is surrounded by thickened insulation material, which can keep food cold or hot for 16 hours. The zipper is not leak proof, be careful not to lay the cooler backpack flat. Large Capacity 30L: The cool bag rucksack size is 11. 8''x8. 5''x18'' 30cm x 21. 5cm x 45. 7cm, which can