Filter stack Caps allow you to store your same size filters safely and keeps them clean and handy for use. A Filter Stack Cap consists of two metal caps, one male and one female. Your filters are secured in between.

I've owned this great product for a while and just had to respond to a previous review: Yes the threads are a bit rough else I'd rate it 5 stars. Answer, put your least-used filters at the ends of the stack and don't over-tighten; or, if you change filters hourly, get a regular case. Otherwise, it's the most accessible, convenient, compact and protective filter storage option available. The earlier reviewer's comment about grinding the filter on the interior finish is nonsense - when have you ground your filter against your lens? They're inset! As for shipping, I've lost my original invoice, but Adorama will ship it for free! Amazon can't be far behind.

This item is made in India. The threads are very rough, there are nicks in the finish and imperfections in the metal. It takes a good 10 to 12 'twists' to open it. There isn't any type of lining, so while you twist away trying to open it, your filter is grinding on the rough interior. Not to mention the $7.95 to ship a $10.95 item that weighs 1.6 ounces. I'd return it, but it would cost more then its worth.