The ultimate mountain biking hydration backpack, complete with e-bike battery storage, a removable back protector and a 2.5L hydration reservoir. Tested to the limit At the Thule Test Center in Hillerstorp, Sweden, products go through extreme testing. Our roof rack systems are designed to carry your gear and fit your car as safely and securely as possible. Below are just a few examples of the many tests conducted. Quality that lasts: All Thule bags are rigorously tested to ensure they will stand the test of time. Our luggage even goes through an extensive 50 tests before it's given the Thule logo. Bluesign system members: We are partners of the bluesign system, an international standard for textile production aimed at reducing the impact of manufacturing on people and the planet. Responsible sourcing and logistics: We obey the principles of the UN Global Compact, as well as ILO and OECD guidelines, and conduct strict audits to ensure our suppliers respect human rights, labor laws, health and safety, and the environment. Features: Ride further with a spare battery (up to 410x100x100mm) in the dedicated, stabilized pocket Protect your central back and spine from impact or injury with removable, lightweight Koroyd CE certified Level 1 back protector Stay hydrated without slowing down using the hands-free ReTrakt magnetic hose return system 2.5L HydraPak reservoir features a slide closure for easy cleaning and a locking bite valve to prevent leaks before and after your ride Superior stability for aggressive downhill riding and jumping with a secure fit Included rain cover keeps gear dry in inclement weather Keep tools, pumps, snacks and accessories organized in dedicated internal pockets Dual front pockets store small essentials Stay cool with a breathable, air mesh back panel Easily access nutrition, a phone or tools without having to remove the pack thanks to lower-back jersey pockets with secure hook and loop flaps Store a jacket or extra layers in the front shove-it pocket Stay visible with reflective details and a light attachment loop Specifications: Dimensions (LxWxH): 9.45 x 9.45 x 18.11 in Reservoir capacity: 2.5 L Model number: 3204482 Volume: 18 L Material: Nylon Weight: 2.29 lb Color: Dark Slate Thule Rail 18L Hydration Backpack - Dark Slate