Thule Rail 18L Hydration Pack

What Our Gearhead® Experts Are Saying:"This pack has seriously changed the game for my long trail rides. The Koroyd back protector gives me peace of mind bombing down technical descents, and the magnetic ReTrakt hose system means I stay hydrated without ever slowing down. It’s purpose-built for mountain biking—and it shows."We ride further, push harder, and stay safer with the Thule Rail 18L Hydration Pack. It’s built with the trail addict in mind—those of us who don't flinch at steep switchbacks, long climbs, and rugged descents. With a 2.5L HydraPak reservoir and a secure, low-profile fit, it stays glued to our back without bounce, keeping water and gear comfortably in place.Inside, there's a dedicated e-bike battery sleeve, internal organization for tools and snacks, and external pockets that make essentials like a wind shell or nutrition bar easy to grab. The removable Koroyd CE Level 1 back protector adds lightweight impact protection without restricting movement. And thanks to the breathable air mesh back panel and built-in rain cover, we stay cool and dry from trailhead to tailgate.