This rain jacket was bought as an afterthought... I'm going to have to carry my sax about a mile to and from a venue next year and I wondered what to do if was raining. Then I discovered this cover was available so bought it on impulse, as it was tailor made for the case I'd already ordered. It tucks into a small pouch integral to the cover itself, so can't be lost unlike a separate pouch. Simple but effective.