Why It's CoolThe contents of your pack, rather than a framesheet or stays, create the Body Wrap's load-transferring structure. Your sleeping bag and spare clothes form the hipbelt padding, by way of three form-fitting stuffsacks (included) that wrap the waist. A center baffle forces you to load gear as two parallel tubesa smart packing style, anywaywhich perform like stays. We pushed the weight to more than 40 pounds. » It's just three pounds eight ounces, yet still well endowed: A lid converts to a summit daypack (and totes a hydration bladder as well), water-bottle pockets fold away, and a bottom compression strap holds a pad or tent. » Nifty hipbelt design snugs sides, automatically cupping hips with parallel straps.Hmmm . . .All those features create a maze of straps. This is one busy pack. » Hydration in the lid causes a bit of slosh.