Here's what other sites are saying:
The Outside Baby Hydro pack is a great way to allow your little ones to proudly "carry their own weight.". This panel-loading rucksack is ideal for carrying snacks and toys, or a favorite stuffed animal. Padded shoulder straps are soft, adjustable and ergonomically designed. Integrated drinking system with 1-liter capacity offers easy hydration on the go (reservoir sold separately). Bungee cinch cord holds a jacket; zippered front pocket secures small essentials.