AG stands for Anti Gravity back system which is used on this fantastic women specific fit pack. It is a suspended system with the world's first fully ventilated hip belt. Perfect for travelling to warm climates, this pack sports seamless mesh and a 3D cavity back panel for superb ventilation. The Osprey Aura AG 65 can be adjusted on the move to obtain the perfect fit and is great at providing load support so you feel less tired on your journey. Great features on this pack include three access points so you can find what you want easily, a large sleeping bag compartment and an integrated and removable rain cover for protecting your bag on drizzly, wet days.