+1 on KM match cases. They are awesome.

You'll see a lot of copy cat cases out there, but KM is the best - and from what I understand - the original. Some of those copies use screws rather than the double o-rings. Big BIG difference. I put some o-ring lubricant (from the local pool store) on mine and it is smooth as silk. I would imagine that the lubricant protects the o-rings too.

Real good folks too!! Worth paying a bit extra for.