A sampling of Middendorf Climbing Gear Designs:
A5 Haulbags were the most innovative of the time, and all current haulbags "borrow" ideas from A5, including the "tuckaway" shoulder straps (an A5 first), the waterproof closure, the offset clip-in, and many other innovations.
A5 design was an alternating process of field testing and building prototypes in the shop. Above are Middendorf's notes written on a back page of a book he was reading during an ascent of El Capitan with new ideas. But A5 was a team effort--below, the 1995 team and the orignal A5 "credos".