Laptop backpack daypack suitable for unisex colour blue style sporty capacity 23 litres weight 1 kg height 48 cm width 305 cm depth 26 cm max laptop size 17 inch features chest strap water bottle pocket padded back internal pockets padded laptop compartment mobile phone pocket glasses pocket tablet compartment outside pockets front pocket side pocket straps tuck away harness compression straps bag feature suitable as cabin luggage iata norm