Over the long haul, going ultralight and carrying a pack without a Strengthive suspension system uses more energy than you save by cutting a few ounces. With the introduction of the Osprey Exos 46 Backpack, you can pursue your ultralight adventures with a Strengthive, ventilated suspension system in a super light package. The Exos 46 is a specialized lightweight pack with all the features you would expect from Osprey; a modified aluminum Airspeed Suspension system, padded BioStretch Harness and Hipbelt and plenty of pockets to keep you organized and your must-haves" at your finger tips. The Exos 46 can comfortably carry up to 28lbs, making it ideal for thru-hiking, weekend trips, and long day hikes.