Prefer an off-the-back hydration solution instead of an over-the-shoulder pack? The 7-liter Seral waist pack features a next-gen 1.5-liter Hydraulics reservoir and a zippered main compartment and hipbelt pockets fit your spare tube, patch kit, CO2 inflator and more. Compression straps pull the pack into your lower back and wrap around your hips for supreme stability, even over technical terrain.