Irix Edge Round Filter Case

Round filters travel badly. Stacked in their own boxes they take up a pocket each, loose in a bag they grind coatings against each other, and the one you want is always the one at the bottom. This case holds a set in an organised interior so each filter has a place and comes out without unstacking the rest.

Irix builds it from materials chosen to keep dust and moisture out and to survive being packed against everything else in a bag. It is a filter case rather than a lens case, which is the point: it is small enough to stay in the bag permanently instead of being left behind on the days you decide you probably will not need filters.