I got one last year from www.sailgb.com like Joe for about the same price. I agree, it's a good bit of kit, and not let me down. I carry the battery in one of the hip pockets of my rucsac, but the disadvantage is that I have to remember this when taking the bag off. The big advantage is not having the weight of the battery on your head, so it's very light and hardly feels you are wearing it.

