Osprey Exos Pro 55

The Osprey Exos Pro 55 is an ultralight pack built for thru-hiking and fast multi-day travel. Its AirSpeed tensioned-mesh back panel holds the load away from your back, and the LightWire frame keeps air moving even under heavier loads. At 941 g for 55 L (46 L main plus 9 L extension) with a 13.6 kg rated capacity, that works out to roughly 58 L per kilogram — solidly in ultralight territory rather than classic backpacking territory. Torso length adjusts across a 43–58 cm range, and the hip belt is padded but fixed rather than swappable, so fit is set at purchase. The shell combines 100D Robic nylon with a 200D UHMWPE NanoFly ripstop panel and a standard DWR coating, but there's no integrated rain cover, so plan for a separate one. Two stretch-mesh side pockets, hip belt pockets, dual ice axe loops, and side compression straps round out the storage. This pack suits thru-hikers and ultralight backpackers who want full-size capacity without the weight penalty, willing to trade some durability and comfort for it.