The Thule Rail Pro is the ultimate mountain biking hydration backpack that comes with e-bike battery storage. A removable back protector and a 2.5 litre hydration reservoir.The Rail 18 was designed from scratch as a dedicated 'big day out' pack for EMTB riders tackling longer rides on technical terrainDedicated central E-Bike battery pocket both protects your precious extra battery and keeps the additional weight low and central on the bodyIncludes a removable Koroyd CE level-1 certified spine protector, the highly innovative Koroyd material has exceptional impact absorption properties whilst remaining lightweight and well ventilated for long, technical ridesAdvanced, reinforced harness and ergonomic form holds loads low and close to the rider to prevent unwanted movement whilst remaining comfortable and unrestrictiveThule's unique magnetic ReTrakt hands-free hose return system keeps your drinking tube safely stowed when not in use but always to handExterior stowage straps for armour,