Andway&reg; 50 Liters Outdoor Backpack with Rainproof Cover and Adjustable Shoulder Straps for Traveling Camping Hiking Material: lightweight and durable nylon,Polyester and different material in combination. First Layer is a grid design for more breathable, the second layer is sponge, the third layer is EVA material for shock resistant Capacity: The capacity of this backpack is 50 liters. In additional, the main compartment of the backpack had sponge interlayer, which able to carry 14 inches computer. Contoured, adjustable, padded shoulder straps. Thick mesh lumbar pad for comfort and airflow against your back High-quality zippers, but also water-resistant. Strengthen key parts to increase the stability of the backpack There is an rain-proof cover in the pocket located at the backpack outside bottom, same as the picture showing