The Osprey Aura 65 Backpack gives the support and comfort we need to enjoy overnight and extended stays in the wilderness. We don't end up soaked in sweat on sunny trails or warm, humid mountain valleys thanks to the cool and comfortable Anti-Gravity suspension system, which is designed to circulate air while conforming to the shape of our backs. It does this with a single, lightweight mesh panel that runs from the top of the back to the hips for a seamless design that helps enhance overall mobility. Throw in an adjustable torso size, hip belt, and shoulder straps, and we get one comfortable pack for our overnight and multi-day backpacking trips.