The Osprey Aura AG 50 is a versatile year-round backpack and the female version of the Atmos. In warm weather, the AG AntiGravity back system provides cooling and comfort thanks to the mesh-padded shoulder straps and hip belt. Load the backpack up with gear and it will still feel like you're barely carrying anything on your back. The Aura AG 50 backpack offers many extras for an outdoor adventure. Stow-on-the-Go walking pole attachment, special organization compartment for dirty gear and protection from the elements thanks to the integrated rain cover. For ultimate comfort, it is important that your backpack is the right size. These Osprey Aura women's backpacks come in different sizes. Size XS/S is suitable for a back length of 33-43 cm. Size M/L is suitable for a back length of 40.5-50.5 cm.