Gear up for any ride with the Thule Rail Hydration 4L Hip Pack. Equipped with plenty of pockets for a phone, bike tools, and nutrition as well as a 1.5L hydration reservoir for all-day thirst-quenching goodness. What makes this fanny complete is the inclusion of Thule's ReTrakt Magnetic Hose System, giving you the ability to power up while keeping your eyes on the trail.