Laptop backpack daypack colours grey black capacity 25 litres weight 15 kg height 47 cm width 38 cm depth 22 cm max laptop size 154 inch size of laptop pocket 36 x 30 x 5 cm features key holder organiser chest strap padded back internal pockets mp3 player pocket laptop pocket outside pockets front pocket side pocket straps ergonomic shoulder straps main compartment feature two main compartments bag feature suitable as cabin luggage iata norm