Good unit to store filters.
The  case holds my Canon CP filter correctly and only comes out when I press the button. My 3rd party filters go in with a click and stay in until I pull them out. Seems pretty sturdy. I took off one star because fit and finish are meh, it looks like a printed part. While my side filter caps fit into the camera adapter and do not fall out (the furthest one to the back) it falls out of this case and are not held in by anything. I would store a cap to keep dust out of the case and adapter but they are not held in by the case at all, not sure why. If this were important it would be a show stopper but I will assume most people buy this for filter and not caps. Over all I am quite pleased with the case and saves a lot of room in my bag.
Rating: 4 stars