Say goodbye to the hamster-wheel futility of elliptical and stair-steppers, and gain real elevation with the trail-happy Sula 18. With enough capacity for spare layering, energy food, and water, plus the ventilated support of the ventilated VaporSpan suspension, this agile pack is a cardio kick in the right place. All you have to do is show up on time—but don’t worry, nature is open 24 hours.<br><br><br>VAPORSPAN VENTILATION: VaporSpan Ventilation system uses a proprietary leaf-spring lower back design to fit perfectly to any back shape and effortlessly carry weight, while keeping the ventilated back panel low profile to maximize interior capacity.<br><br>EVAP MOISTURE WICKING TECHNOLOGY: Incredibly cool and comfortable back panel performance in all weather conditions.<br><br>BREATHABLE, CUSHIONED SHOULDER STRAPS: Ultra-cush shoulder harness with top tier EVA foam and ventilated design for long lasting comfort.<br><br>FRONT ZIPPERED POCKET: Front zippered pocket with soft-touch, padded liner to protect sunglasses and electronics.<br><br>INTERNAL HYDRATION SLEEVE: With SpeedClip integration system for easy use with Gregory's 3D Hydro Reservoir.<br><br>SUNGLASS QUICKSTOW SYSTEM: Sunglass storage system on shoulder harness for quick, secure and scratch-free access to your shades without taking the pack off.<br><br>STRETCH MESH STORAGE POCKETS: Front & side stretch mesh pockets for quick access to water bottles and an extra layer.<br><br>COMFORT-GRIP ZIPPER PULLS: Custom molded zipper pulls.<br><br>INTERIOR ORGANIZATION POCKET: Zippered interior mesh organization pocket with key clip.<br><br>MOLDED WEBBING KEEPERS: Molded webbing keepers for strap management.<br><br>COMPRESSION STRAPS: Side and bottom compression to stabilize your load.