Material: 88% Polyester, 12% Spandex. A real classic. Volume: 20 LHardwearing material.Normal fit.Adjustable sternum strap.Adjustable shoulder strap.Multiple, practical pockets.Compartment at the bottom with rain cover.Columbus 20L backpack by Swedemount. Roomy, lightweight backpack with adjustable bands. Multiple, practical compartments with zipper. Hardwearing material perfect for hiking and everyday life.