OK, kids! Time to hop on those bikes and head off to the playground - with a bottle of juice, cookies, and a rain jacket stashed in your MOAB JAM! Ideal for biking and hiking, this pack has room for all the essentials plus a hydration system. And the carry comfort is simply superb.The secret lies in the ACS TIGHT back system, which has been specially adapted for use by primary school children. The pack sits close to the body - snug and secure, with no wobbling or slipping - which makes the adventure a lot more fun. The ventilation channel delivers a constant flow of fresh air to cool the back.Reflectors provide extra visibility in road traffic, and there's a special loop at the front for an LED light. Approximatley 15"L x 11" W x 4" D