This pack keeps kids hydrated, safe, and organized for freewheeling and fun bike rides.. . . . . Kids lightweight mesh back panel and harness reduce overheating. Adjustable shoulder straps allow the pack to grow with your child. 1.5 L Antidote reservoir with quick snap cap, low profile fit for stability, and lighter fill port to cut weight. Reflective strips and a blinky light loop blinky light not included for increased low light visibility. Main pocket for stashing a layer or snacks. Bike tool organizer pocket keeps essential tools neat and easy to find. Integrated sternum strap whistle in case of emergency . Torso length of pack: 12 in. 28 cm.