Dakine Backpack Manual 20L radness 2015/16 Skate backpack Dakine Manual will love all skateboarders. The front has 2 Velcro straps to hold your skateboard. The main pocket has a two-way zip fastening. There is one more zippered pocket for small items. The back panel is reinforced and the shoulder straps are padded. The size of the backpack is 20 L. The dimensions are 50 x 30 x 15 cm. Material 600D polyester.