It is a little small, so if one were to have a lot of volume, there would be difficulty getting everything in.Also, the connection of the 2 halves is by open plastic and a plastic protrusion insert that is on both sides of a ring. That means that last snap connection is somewhat nervewrecking and difficult because it takes a good amount of force and everything is scrunched in and plastic inserts have to be exactly positioned, this causes probabilities of pinching, which does happen, which is not a good experience. The final snap lock should be designed better, it should be easier to connect the 2 halves, instead of making it very rigid with low tolerances in the design.After it is put on, it is not uncomfortable, it is comfortable enough where it is fine to wear for long periods of time.The lock works okay with the key, it takes a little jiggling sometimes.There are 4 different ring sizes to help accommodate size differences, but it doesn't cover all sizes in every area since the ring just covers the base area.Overall it is an okay experience, but could use more improvements in the design for comfort when putting on or taking off.