Oakley Motion 26 Backpack - 1587cu in Black, One Size 80% Nylon, 20% Polyester Volume: 1587 cu in Dimensions: 20 x 13 x 3 in Pockets: [external] 1 water-resistant zippered front, [internal] organization Material: 80% nylon, 20% polyester Recommended Use: commuting, hiking, school