evo.com | Osprey Fanny Packs > The Osprey Seral 7 Lumbar Pack gives you 1.5 liters of hydration without a hitch. It features a magnetic bite valve for easy hydration access, a zippered main compartment for your repair kit, and compression straps that keep it securely in place - perfect for riders who don't want to deal with a sweaty backpack as they ride. Accent Recycled 400D High Tenacity Nylon Included Osprey Hydraulics 1.5L Lumbar Reservoir by Hydrapak AirScape Backpanel with Contouring Lumbar Wrap Provides Maximum Stability Large Zippered Main Compartment with Reservoir Sleeve 8.5" H x 12.5" W x 6" D | Osprey Seral 7 Lumbar Pack 2026 in Purple | Nylon