Lumbar-style packs have come back into vogue for cycling and hiking, and Osprey has long had lumbar design experience. For many cyclists, especially on the Enduro/advanced trail side of the sport, keeping the weight low on the hips with their back and shoulders free from load and/or coverage is desirable. The Seral Lumbar Hydration Pack was built for any rider who want to make this equipment shift.

If your preference is for an off-the-back hydration solution instead of an over-the-shoulder pack, the Seral lumbar pack is for you. There are a lot of luxuries we can go without on a mountain bike ride, but water isn’t one of them. The Seral lumbar pack is designed to carry an included 1.5-liter lumbar reservoir with a magnetic bite valve that attaches to the hipbelt for easy access while you pedal. Compression straps pull the pack into your lower back and wrap around your hips for supreme stability, even over technical terrain. Some lumbar packs have a tendency to creep around while you ride—we promise this one won’t. A zippered main compartment is big enough for a spare tube, patch kit, mini pump, tire lever, and multi-tool, while hipbelt pockets can store your keys, sunscreen, phone, and trail snacks.

A dedicated hydration compartment stores the 1.5L lumbar reservoir and compresses for stable carry. Osprey’s Hydraulics LT 1.5L Lumbar Reservoir by Hydrapak is made for those who prefer the Seral's off-the-shoulder hydration solution. Designed to fit in most lumbar packs, it's twin-welded chevron baffles stabilize the water and maintain a flat profile. Thoughtful design makes filling, cleaning, and staying hydrated on the trail easier than ever. All parts are BPA-free, phthalate-free, lead-free, guaranteed. All materials are certified food safe according to FDA and EU regulations. Don't worry about the weight, the bike-specific, angled hipbelt and compression straps provide stability and comfort by keeping the pack close to your body. If you have wanted to try or move to a lumbar cycling hydration pack, the Osprey Seral is the way to go.