Versatility is the name of the game with the REI Flash 18. For use in your larger backpack or duffel, this lightweight daypack cleverly converts into a stuff sack simply by turning it inside out Turn inside out and its a stuff sack to help organize your gear once at basecamp, reverse it and use as a daypack for short hikes away from camp. Hydration-compatible design has an hose exit port and an internal sleeve to hold a hydration reservoir, sold separately. Top-loading entry features an efficient, single drawcord that cinches skirt closed with single tug small flap covers the opening when cinched closed. Lightweight shoulder straps supply comfortable load carrying adjustable, sliding sternum strap adds stability and helps keep straps ideally positioned. Front of pack features twin daisy chains running vertically and a tool loop at the bottom for attaching items on the front of the pack. Storage sleeve inside features organizer slots sized for the Ten Essentials. 140-denier ripstop nylon construction provides increased durability without added weight polyurethane coating offers weather resistance.