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When it comes to long-distance backpacking, our backpack's comfort is just as important as a good pair of hiking boots, and the Atmos AG 50 Backpack is Osprey's best-fitting backpack built for multi-day or overnight adventures. Multiple adjustments move the padded shoulder straps up and down the spacer mesh back frame for an exact fit to put ventilation and cushioned support right where we want it. The padded Fit-on-the-Fly waist belt lets us buckle, cinch, and go without hassling with a bunch of micro-adjustments.