KAKA Waterproof Swiss Gear Multifunctional Men Luggage & Travel Bagsrucksack Backpack Hiking Bags Students School Shoulder Backpacks Laptop Macbook Computer Business Bag Big Capacity 55L Airflow design provides extra padding for comfort and maximum back support Shoulder Strap System Specially contoured shoulder straps are ergonomically designed with added padding for comfort and control Water Bottle Pocket Designed to adjust backpack volume while securing contents and preventing unwanted vibration Size:34*16*65cm Capacity55L Waterproof material