Osprey Packs Women's Viva 65 Backpack The easy torso adjustable harness fits torso sizes 17"-23"/43-58.5cm The fit-on-the-fly hip belt pad extends up to 6 inch/15cm to accommodate different hip sizes and provides a custom fit Osprey's stow-on-the-go trekking pole attachment is designed to quickly attach and carry trekking poles while wearing a pack An internal reservoir sleeve is located in the main body of the pack, Allowing easy Loading and unloading of a hydration reservoir An internal compression strap that helps tighten and stabilize the load