The ventilated mesh backpanel of the Atmos 65 was a breakthrough design several years ago, and now Osprey has improved the entire Atmos line that gives it even more fit-adjusting capability with an adjustable harness in addition to the sized variants. The Atmos 65 gives most backpackers plenty of room to haul enough gear and food for extended week long trips on an lightweight ultra-comfortable frame with a mesh hipbelt that provides superb fit and comfort.