I've got a HAWG NV, its brilliant. The NV system is a big improvement over the non NV 'baks. My older Lobo used to irritate the skin on my back, because of the sweat build-up and constant rubbing. The HAWG NV is much more stable and you can feel the cool air flowing down your back, much like you can feel it flowing through your helmet. It has massive capacity, good for commuting, for all day rides and walks too but all of that capacity can be compressed away with straps when its not required. One of the best birthday presents I've ever had.