The backpack is made of a dirt-resistant fabric. It has one compartment and three open pockets inside. Outside, there is one, smaller pocket with a zipper. The back is made of perforated fabric. The straps are adjustable so you can adjust them accordingly. Be sure to check out our entire collection of BIG STAR accessories! Dimensions: Width - 35 cm Height - 44 cm Thickness - 14.5 cm