Cylindrical shape requires no special mouth orientation. Unique mechanism delivers full flow with just a soft bite. Will not leak even under pressure or with prolonged use. Build-in bayonet style shut off.
Source's Rapid hydration pack offers variable storage space with its detachable pouch on top of two mesh-pockets for gels or energy bars and a zippered pocket fitting a mobile phone of any size offer storage for essentials.
It's fun, it looks good and it's functional: The SPRY Hydration Pack for Kids has a separate compartment for the 1.5L Widepac Hydration System (included), two zippered pockets for snacks and other essentials, and external cargo space for a jacket.