This backpack is made of CORDURA fabric, which is water-resistant, durable, lightweight, and supple. I haven't used it much and it's been stored away for a long time, but it's well-made and I think it can still be used! Size (measured flat) Back length: 41cm Bottom width: 31cm Gusset: 13cm Pockets: Inside back: 1 Outside back: 1 large (with inner pocket) Outside sides: 2 small