Keep your kids hydrated and feeling fresh on the trail with the HydraJet Backpack from Osprey Packs. This rugged day hauler features durable materials to stand up to any abuse your youngsters can dish out, and it includes a 1. 5-liter hydration reservoir to help them stay hydrated. Dual stretch mesh pockets provide a place for extra water bottles or other items as well. An extra rain layer can be stashed on the back for when the weather turns, thanks to the front panel bungee.