"Streamlined, lightweight, and ready to ride, the Osprey Berm 4 Bike Hydration Pack keeps essential water at the ready and secures a few on-the-road must-haves. First and foremost, this pack comes with a Hydraulics LS 2.5L Reservoir, along with an adjustable sternum strap and a magnetic bite valve attachment. The pack's easy-access S-shaped zipper makes refilling the reservoir simple. While you travel, a ventilated bike-specific harness combines with a mesh-covered, ridged-foam AirScape Backpanel, and removable webbing hip belt. Together, this trio provide riding stability and a comfortably close fit. This biking pack also boasts a zippered front pocket with key clip. Reflective details and a blinker light attachment (light not included) enhance riding safety. All fabrics used to create the Osprey pack are bluesign approved. Main fabric is 300-denier 100% recycled polyester, lining is 70-denier 100% recycled nylon, and the mesh backpanel and harness are 100% recycled polyester. Imported. Reservoir compartment with easy-access S-shaped zipper Hydraulics LS 2.5L Reservoir Adjustable sternum strap with magnetic bite valve attachment Zippered front pocket with key clip Reflective details for safety Blinker light attachmentSpecs: Volume: 244 cu. in. / 4L Dimensions: 15.4""H x 7.5""W x 5.5""D. Weight: .97 lbs."