Bonded walls refer to the process of using heat, glue and pressure to bond things together, in this case with the north trail, its the walls, floor, and ceiling.......Within the bonding process there are a couple of ways to do this....One is by using a big bag, that is sealed and the pressure is applied, this is refered as Vacuum bonding...........North Trail uses the Bag for its roof and floors and uses a pinch roller for its walls.............
Hope this helps
Mike C