I bought one of these for extra protection as the Lensbaby lens comes with only a microfiber bag. It fits great with my Composer Pro with Sweet 35 Optic. The latter optic has an inbuilt aperture ring rather than using separate aperture discs.
The case is a hard case and offers good protection for your lens. It is only a little larger than the actual lens and does not add much extra bulk. When not on the camera I keep my Composer Pro with Sweet 35 Optic permanently in its case. Five stars for use in combinationm with the Composer Pro with Sweet 35 Optic.
The case will fit any Composer, Muse, Scout, or Composer with Tilt Transformer.