Thule Uptake 4L Hydration Pack is a high-quality bag designed to deliver water with ease. Its best feature is the magnetic, hands-free ReTrakt hose retainer. The pack features a 2.5L HydraPak reservoir with a slide closure system and locking bite valve to prevent leaks. It offers 4-liters of cargo space for organizing pump, tools, nutrition, and extra layers. An exterior zippered pocket keeps your phone and keys safe and secure, and reflective trim for visibility in low-light conditions.