What Our Gearhead(R) Experts Are Saying:"The Jet 18 is perfect for getting kids excited about the trail. It fits comfortably, holds their essentials, and is hydration-compatible, so they can stay fueled and happy on longer hikes."The Osprey Packs Jet 18L Hydration Pack is built to inspire young adventurers to explore the great outdoors. With a comfortable AirScape(TM) backpanel and a kid-friendly design, this pack is perfect for hiking, biking, or any trail-bound escapade. Its bucket-style opening makes loading and unloading simple, while multiple pockets-including dual stretch side pockets and a large front stretch pocket-keep essentials like snacks and treasures close at hand. The Jet 18L also features an external reservoir sleeve, compatible with the Osprey Hydraulics(R) LT 1. 5L reservoir, so staying hydrated is a breeze. Daisy chain attachment points add versatility for extra gear, encouraging kids to embrace movement and adventure in every outdoor outing.