The Osprey Atmos AG 65 wins for most users due to its superior ventilation and included raincover, backed by 4.7 lb weight and Anti-Gravity suspension praised in 2024 Outdoor Gear Lab testing. Gregory Baltoro 65 counters with tougher 210D nylon fabric and better longevity ratings from Backpacker magazine long-term reviews. Both fit 16-21 inch torsos and handle 65 L loads effectively but differ ...