Whether you're headed out on a cush weekend trip filled with creature comforts or tackling a summit, Osprey's largest volume pack, the Aether Plus 100 boasts a beefier frame for big adventures and offers a stable carry that can manage the heaviest of loads. Featuring a Custom Fit-On-The-Fly Hipbelt and Shoulder Strap and a convertible top lid daypack. Constructed with high quality bluesign®-approved high-tenacity nylon and PFC-free DWR. Key Attributes  Custom FitA Custom Fit-on-the-Fly Hipbelt, Custom Fit-on-the-Fly Shoulder Strap and adjustable torso length allow for a fine-tuned fit for a variety of body shapes and sizes.DurableDurable for extended use on the most rugged trails. Load Capacity Osprey's largest volume packs provide a stable close-to-body carry, ideal for managing heavier loads when the trail gets technical. Sustainable Materials Constructed with high quality bluesign®-approved high-tenacity nylon and PFC-free DWR. Features Removable top lid converts to DayLid daypack Included raincover made with PFC-free DWR and bluesign®-approved materials Stow-on-the-Go trekking pole attachment Floating top lid with lash points Integrated FlapJacket cover for lidless use Dual front panel zippered pockets for easy-access storage Large front panel zip access to main compartment Fabric reinforced front shove-it pocket Large dual-access stretch mesh side water bottle pockets Dual upper/lower side compression straps Dual front panel compression straps with StraightJacket compression Dual zippered hipbelt pockets Dual ice axe loops with bungee tie-offs Zippered sleeping bag compartment with removable divider Removable sleeping pad straps Internal hydration reservoir sleeve Carry Information Enhanced Load Transfer The Custom Fit-on-the-Fly Hipbelt integrates the LightWire frame into the adjustment system—creating a better distribution of weight and, in turn, a better carry. Custom Fit-on-the-Fly Hipbelt Extendible Custom Fit-on-the-Fly Hipbelt offers a precise fit for varying waist sizes Incremental length and angle adjustments allow for a fine-tuned fit Crossbody ErgoPull hipbelt pulls weight into lumbar when hipbelt is tightened Custom Fit-on-the-Fly Shoulder Strap Custom Fit-on-the-Fly Shoulder Straps allow for a precise shoulder wrap and fitSpacer mesh fabric provides a soft and comfortable contact surface Airscape Backpanel Injection-molded, die-cut foam AirScape framesheet maintains comfortable back contact with ventilated airflow channels and maximum stability for carrying heavy loads Mesh-covered foam lumbar for supportive, lightweight and comfortable contact surfaces Specifications Load Range 18-32 kg Volumes and Weights US and International weight and volume specifications Size cu. in. liter lbs/oz kg. S/M 5980 98 6.39 2.9 L/XL 6102 100 6.69 3.03 DimensionsDimensions are shown as length (height) x width x depth Size Height Width Depth Aether Plus 100 Litres S/M 82 cm 42 cm 40 Key Fabrics used: Main: bluesign®-approved 210D high-tenacity nylon, PFC-free DWR Accent: bluesign®-approved 210D high-tenacity nylon honeycomb contrast, PFC-free DWR Bottom: bluesign®-approved 210D high-tenacity nylon, PFC-free DWR Sizing and Fitting of your Osprey Pack Fit is the key to pack performance. Take the time to get it right. Most Osprey packs are available in multiple sizes to fit a range of torso lengths. To find your torso length, have a friend measure your back along the spine (as shown in the picture below) from the level of your iliac crest (the top of your hipbones) to your C7 (the knobby bone at the base of your neck).  Use the table below to determine your pack size. Osprey Aether Plus 100 Men's Hiking / Mountaineering Backpack