Butterbox (or Mt Hay) canyon is a spectacular canyon on the south Gross Valley in the Blue Mountains. The main drop of 40m is done in two stages, re-belaying off a chockstone, then down a waterfall. The exit requires some low grade climbing back to the top of the escarpment.
Note: This video is for the information of those wishing to visit the canyon, it is not meant as a cinematic masterpiece, so please don't complain about the music (or lack thereof).