After years of requests, Mystery Ranch decided to build a backpacking-focused pack with its OVERLOAD feature, a longtime favorite from years of hunting and military packs. The Terraframe 3-Zip 50L Backpack uses rigid, carbon fiber frame stays as a suspension system that's both torsionally flexible and supportive of excessive loads, your secret weapon for going big in the backcountry. This internal-external hybrid Guidelight frame allows you to detach the pack from the frame, creating an overload shelf for adding additional gear you can't fit into the pack.