Upgrade your Vapor Current Pack from Granite Gear with the Vapor Current Airbeam Frame to save on weight and add load capacity. Not to mention, use it as a sleeping bag extender with your 3/4 length pad. This is the first framesheet that has a positive correlation with load. Up to 40 pounds the framesheet gets stiffer as the backpack load increases. The concept rests that under medium to high pressures (4-10 psi) the framesheet resists horizontal collapse, allowing for chambers of air to maintain vertical orientation and allow gravity to force pressure downward directly to the hips for optimum load transfer. This is the first framesheet that is vertically rigid to maximize load transfer, but compliant during motion and conforms with the human body during strenuous activity, and allows malleability for simple tasks such as bending over and tying your shoes. This framesheet was designed to increase comfort while decreasing weight, and to sacrifice nothing in rigidity and load carrying capability.