Jetflow Tomahawk Hydration Pack Included Jetflow hydration system fits most standard bottles, hydration bladder is not required and is not included. Lightweight Hydration Pack with Single Storage Pocket Extremely Durable Design, Rip-Stop Material, Lightweight and Adjustable for Children to Adult Adapter Included for 20 oz bottles: Gatorade, Vitamin Water, Powerade, and Sobe Adapter Included for Nalgene Bottles, Jetflow Bottles, Lifeline, and all 63mm big mouth bottles