Cycling backpack childrens backpack suitable for childrens colours yellow blue style sporty capacity 4 litres weight 036 kg height 38 cm width 20 cm depth 6 cm features hydration compatible reflective elements chest strap hip strap padded back internal pockets mobile phone pocket glasses pocket outside pockets front pocket additional fastenings safety light loop straps ergonomic shoulder straps bag features suitable as cabin luggage iata norm