The Osprey Atmos 65 AG pack will make you feel like your defying gravity. With multiple points to evenly distribute the weight of your pack, you won't believe you're actually carrying how much you're carrying. Enhanced mobility and the option to remove parts makes this pack work for each individual adventure. LightWire™ peripheral frame, structural load lifter bars and hipbelt transfer load Anti-Gravity ventilated mesh back panel contours automatically to the body Removable floating lid contains 2 zippered pockets for quick-access essentials Integrated FlapJacket™ protects contents from foul weather and rain during lidless use Dual stretch-mesh side pockets, zippered hipbelt pockets, and large front stash pocket Back bottom contains zippered sleeping bag compartment Removable sleeping pad straps on the bottom of the pack 2 front panel zip pockets, ice tool loops,and trekking pole attachment Hydration sleeve and ports Water reservoir not included Imported Best Use:   Backpacking Frame Type:   Internal Frame Adjustable Torso:   Yes Material: 11 denier x 630 denier nylkon dobby / 420 nylon packcloth Frame Material:   LightWire Number of Stays:   1 Peripheral hoop Suspended Mesh Back Panel:   Yes Number of Exterior Pockets:   9 and main compartment Gender:   Men's * Capacity / Weight / Fit * Capacity: (S) 62 Liters / (M) 65 Liters / (L) 68 Liters Weight: (S) 4lbs 3oz / (M) 4lbs 6oz / (L) 4lbs 8oz Torso Fit: (S) 16-19 in / (M) 18-21 in / (L) 20-23 in Waist / Hip Fit: (S) 24-45 in / (M) 24-45 in / (L) 29-55 in Love this pack. Very comfortable with heavy loads. Bought the Osprey Atmos 65 AG and am very happy with my purchase so far. I needed a large pack because I have to carry a CPAP machine and a battery along with my other camping gear on the trail. All together with food, water and gear my load was 40 lbs. It didn't feel like 40 with this pack. The weight was distributed well and the medium size pack fit me perfectly with a few minor adjustments. Got rained on pretty hard my first time out. My only complaint is that the rain fly really didn't work all that well. I didn't have the gear in the bottom of my pack in a dry bag and it got wet. My chest strap popped off and I had a difficult time getting it reattached to the main strap but that was use error. All in all a great bag. I got a killer deal on it from Mountain High Outfitters. Shipping was super quick too. I think I got it in 2 days after ordering. Looking to get one for my wife soon. Very satisfied. Quick delivery and an excellent price. I would definitely use Mountain High Outfitters again.