Features 2.5 liter hydraulics lt reservoir included providing on the go hydration A stretch body Wrap harness is designed to move with you during high Activity endeavors A reverse Spacer mesh back panel provides a soft, irritation free contact surface for the ultimate in back panel comfort and high Activity performance The Rev bio stretch body belt featuring stabilization wings is designed for stability and comfort during high Activity endeavors A removable Drop down Digi flip media pocket provides secure storage and Quick access to all manner of touch screen mobile devices Description Product Description Made to travel light and fast, osprey's rev 18 is ideal for a big day hike or an endurance race. Designed for ultimate all-day comfort, the suspension system is based around osprey's innovative bio stretch body wrap harness and hip belt system. Dual chest straps maintain load stability and the breathable mesh back panel provides ventilation and a soft, irritation-free contact surface. Access the main compartment via a zippered panel. Inside, a slash pocket secures valuables. Outside, a front panel bungee provides compression and a place for a bulky layer. Stretch mesh side pockets and two zippered stretch mesh body belt pockets provide additional storage options. Inside the pack's separate hydration sleeve, you'll find a 2.5 liter hydraulics lt reservoir with magnetic bite valve for sipping on the go. Built-in baffles in the reservoir reduce barreling and sloshing to minimize the chances of chafing over the course of a long day on the trail. And should that long day turn into a long night, the graphics are reflective to enhance your nighttime visibility. A weatherproof Digi flip media pocket drops down from the shoulder harness for quick access to your device. It is removable when you want to disconnect and fully engage with nature and the sound of your breath.