Ideal if you want to film in water, bike, hike, without leaving the GoPro your bag (if you are not wearing it on eg helmet). Product well designed, however the scratch system of the small rubber strap is not the best idea that took GoPro: this scratch can be easily removed if we are not careful, and the strap is lost soon I think ... Not cheap (as all GoPro products) but very useful. Too bad there is no possibility to rotate the casing in portrait mode.