Polyester Polyester lining Made of 600D polyester. Approx. dimensions: 52 x 38 x 19 cm/ 20.5 x 15 x 7.5 inch. Approx. weight: 1.9 kg/ 4.2 lb. Capacity: 37 L/ 2258 cu in. Complies with the flight size standard. Convertible trolley backpack is built with front zip pocket for quick accessing your travel belongings, middle zip compartments with multiple inner zip and slip pockets for better organizing your accessories, from passport to clothes. Wheeled suitcase backpack provides hide away shoulder straps for easy conversion, exterior compression buckle straps for stabilizing your bag and spinner wheels for smooth-rolling mobility in any direction. Rolling, backpack or tote this rolling luggage backpack on the go. Convert to different carrying styles during your trip for easing your stress. Suit for both women and men to pack for traveling, business, weekend out, overnight trip, camping and other indoor or outdoor activities.