The Hydro Sling is an adjustable hydration pocket that will fit a wide range of hard and soft water bottles from a 32 oz. Nalgene to a 1 Liter Vapur bottle. The Hydro Sling’s ride location can be adjusted for personal preference, from directly under your arm to back towards the side of the pack. The 3/4″ webbing attaches to the pack compression straps and shoulder straps in a variety of configurations allowing it to be used with many brands of packs, not just Stone Glacier packs. The front strap loops around any strap or member of the pack, the back strap will “piggyback” off any compression strap with the 1″ trislide.