REI Co-op Flash 18 Pack Blue NWT Recycled ripstop nylon fabric features a nonfluorinated durable water repellent (DWR) finish to help moisture bead up on the surface Waistbelt and sternum strap can be detached to save weight, bringing total pack weight down from 9.5 oz. to 7.7 oz. Hydration-compatible design includes a hose exit port and an internal sleeve with a hang loop for a reservoir (reservoir not included) Back panel is lightly padded; pad slips out for use as a sit pad Breathable mesh shoulder straps have fold-over padding that softens contact with your neck and shoulders Single-handed, quick-pull drawcord with small weather flap seals the top Zippered side pocket for easy access and added security Sunglass loop on left shoulder strap lets you hang your shades 2 interior slip pockets Exterior loops can be used to lash on extra gear, add compression or tie the Flash 18 to a larger pack For use in your larger backpack or duffel, this pack converts into a stuff sack simply by turning it inside out Tool loop with tuck-away pocket REI is Climate Neutral Certified; as we work to actively reduce our footprint, we measure annual carbon emissions and purchase an equivalent amount of verified carbon credits Product meets the bluesign criteria