Osprey Women's Sirrus 50 Backpack The integrated, removable raincover provides pack protection in adverse conditions An internal reservoir sleeve is located in the main body of the pack allowing easy loading/unloading of a hydration reservoir Osprey's Stow-on-the-Go trekking pole attachment is designed to quickly attach and carry trekking poles while wearing a pack A zippered sleeping bag compartment with divider provides easy access to internal contents and allows you to use your pack with one compartment or two The floating top lid can extend to accept oversized loads or can be removed from the back body for weight saving lidless use