We guarantee the bed supports 1,000 pounds. To achieve this, the cots have an aluminum frame overlaid with burly nylon. Six webbing pieces hang from the frame to anchor it. Each one holds 500 pounds. We test all these weight thresholds with a machine that stretches the webbing until the nylon breaks—usually at around 700 pounds. It’s actually the teeth of the built-in buckle (which allows climbers to adjust the height of the ledge) that cuts the fabric at that weight. The material alone could withstand 1,250 pounds before breaking.