Osprey Seral Hydration Pack

Because the weight sits on your hips rather than your shoulders, the Seral keeps your center of gravity low. This design significantly improves balance and stability, making it much less likely to shift or bounce when you are navigating technical mountain bike trails.

Yes, the 7L capacity is designed for essential trail gear. You will have enough room for a multi-tool, tire levers, a spare tube, a light windbreaker, and snacks, though it is not intended for bulky items like extra layers or heavy cameras.

The included 1.5L Hydraulics Lumbar Reservoir features a wide-mouth opening, which makes it straightforward to fill, clean, and dry out after your ride. We recommend rinsing it thoroughly and letting it hang dry completely to prevent any buildup.

The Seral uses a contoured hipbelt specifically shaped to wrap around your waist for a secure, bounce-free fit. When combined with the compression straps, the pack stays tight against your body even when you are moving actively.

The pack is water-resistant, meaning it will handle light rain and trail spray effectively thanks to its durable, coated materials. However, it is not fully waterproof, so you should use a dry bag for sensitive electronics if you anticipate heavy downpours.

The AirScape backpanel features ridged foam channels that create space for airflow between your back and the pack. While no pack can eliminate sweat entirely, this design significantly improves ventilation compared to flat-backed lumbar packs.