Osprey Packs Atmos 50 Backpack Adjustable Harness- The Torso Adjustable Interchangeable Shoulder Harness allows 3 / 7.5cm of adjustment for a fine tuned fit while using a new pad design, spacer mesh and ventilated foam for breathable, supportive cushioning. Removable Sleeping Pad Straps- Removable sleeping pads straps add a level of performance versatility. Sleeping Bag Compartment- Atmos/Aura 65 packs include a zippered sleeping bag compartment with removable divider. Tool Attachment- Each Atmos/Aura Series pack features dual ice tool loops and bungee tool tieoffs. Vertical Zip Pocket- Dual vertical zip front pockets allow for easy gear organization.