Brand:CoolBELL Description:Convertible Sport Backpack Size:19.0 x 11.0 x 11.0 inches; Fits up to 17.3 inches laptop. Weight:1.2 kg Material:Oxford Nylon cloth; 210D waterproof polyester lining Bag dimensions:19.0 x 11.0 x 11.0 inches, Volume:45L; Fits up to 17.3 inches laptop. Roomy enough for you.Main compartment with 45L volume is totally enough for keeping your sport time and daily time use items like: sport equipment, clothes, bottles,shoes, and one 15.6 inch laptop. So comvenient for your life Convertible design. You could easily convert this bag to backpack, shoulder bag, and duffel bag. Also the back strap can be hidden in the back compartment. Using accasions: You could use it as a hiking bag, travel bag, business bag, laptop backpack and shool bag, multi-functional design will meet your daily need.Water-resistant design with high quality Oxford clothes make it more durable and stable. Lightweight design is easy for carrying. The top grab handle offers quick grab-and-go style. Ergonomic design ensures the dispersion of gravity of the fulled bag. Using Occasions: 1.Sport time. You could use this backpack as a sport bag, 45L volume is totally enough for keeping your sport equipment like Table tennis rackets, Badminton rackets , bottles, towels and sport clothes etc. So convenient for you. 2.Daily time use. You could use it as daily bag, like shopping, trips, biking, school life etc. 3.Travel backpack. Go on a hiking, traveling, business with a plane travel, this bag is a better choice for you. CoolBELL Sport Backpack Convertible Bag Shoulder Bag Briefcase 45L Travel Knapsack Light-weight Water-resistant Backpack Sport Duffel Fits 17.3 Inch Laptop For Men / Women (Black) - B076J74V9P Brand coolbell SKU 100230623_NP-1020490689