The Gossamer frame is designed to complement our packs that have the Intex II tubular frame. The interchangeability of these two frame types fulfills the Intex II modular concept. The basic design of packs equipped with the Intex II is intended to take advantage of the frame's superior support, comfort, and load-bearing interface with the human body. But there are times when you may want a flatter or more compressible pack, or a more flexible overall structure, and it is for these reasons that we've developed the Gossamer. Made of polycarbonate with vertical-axis stiffening channels, the Gossamer gives an ideal mix of vertical support and torsional flex. It is quite tough and is superior to polyethylene frame-sheets which form the core structure of most internal frame packs. Thus, the Gossamer is a simple and high-performance means to convert your Intex-II equipped pack to a more traditional internal frame pack. Once you're equipped with a Gossamer, you'll be able to switch your pack b