With so much camera equipment available and so many camera accessories to go along with it, you may find your camera bag getting pretty cramped. If you want to store and protect your collection of filters, but don't have the room for a filter wallet, pouch or case you may want to consider filter stack caps. These items may save you some much needed space as they attach to your filters when you aren't using them. They are metal filter caps that are designed to protect filters from dust and scratches while not in use. All you do is screw your filters together and then screw a stack cap on to the top and bottom filter. This will protect the stack of filters. Stack caps are available in various sizes and range in price from about to $10 to $20.