Osprey's Rev 1.5 hydration pack is a perfect lightweight companion for quickly navigating the trails. Its Biostretch harness moves with you during high activity endeavors, offering stability and comfort. A 1.5-liter Hydraulics LT Reservoir ensures you are properly hydrated while harness pockets store an extra water bottle and food so you can refuel on the go. The main compartment and outside bungee cord allow you to carry extra layers so you're ready for unpredictable weather. Plus, the Rev 1.5 features a sunglasses pocket and an easy-to-access DigiFlip pocket for your phone.