This is a very high quality case that is a custom fit for modern Selmer alto saxophones. It should fit a Mark VI or VII perfectly as well. I use it for a Reference 54. The cushioning on the inside is amazing and the horn does not move around at all. There's a generous interior pocket for reeds, neck strap, cork grease, mouthpiece, etc., and organizational pockets on the outside as well. Backpack straps are well built and trusty. If you need more storage, consider a padded pouch to store more items inside the bell, but most users won't need that. These cases are not cheap but the quality is excellent.