Hydrapak Avail ultra-light hydration pack is enhanced with internal compartments, Plug-N-Play technology, and full side zip loading; improving capacity while keeping the pack"s original minimalist intent. According to bicycling magazine "It takes some pretty fancy engineering to make 70 ounces of water nearly disappear on your back. Yet, that is exactly what Hydrapak does with its impossibly light (7 ounces empty) Avila hydration Pack." Features: Cross Soft Nylon Diamond Rip stop with Interlock Stretch Fabrics, 360 Degree Reservoir Insulation, Mesh Pocket with Pump Loop, Silky Slider Sternum Strap, Key Clip, Reflective Light Loop. Specs: Weight: 7.1 oz., Gear Storage: 45 cubic inches., 70 ox (2.0 L) Reversible Reservoir II with Classic Connector, Measures 13” x 6” x 2.75”.