I've used this pack on several mountain bike rides and hikes. I'm extremely pleased with how stable it is when loaded with gear and a hydration reservoir. Most of the mountain bike rides were on very technical trails. The pack distributed the weight evenly, felt light on my back, and the pack stayed in place over the rough terrain. I also appreciate the rear access, so you don't have to fully remove the pack. Keep the waistbelt clipped, slide the pack around to the front for quick access, and then back to the trails.
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