a number of packs in this test—the Tenzing included—feature internal frames constructed of metal rods that provide support under tension. It’s a light and strong system, but it’s also fragile. If the frame gets bent or loses its tension, it can fail, as it did when we loaded the Tenzing with 50 pounds of Idaho spuds. The lack of a substantial hip belt meant that the TX 15 was uncomfortable with even moderately hefty loads. Despite top and side entry, the main pocket was hard to access, and the fabric abraded in our drag test.