The Torpor filter pouch is made of neoprene, like a wet suit. It’s stretchy, protective, and has some padding—perfect for holding filters. I have a spare camera battery holder made of the same material, and it works great. I expect this will too. Each pouch can hold two filters, back and front. I carry 58mm filters with me, and they are easy to get in and out with a little practice. These pouches are well-stitched and have reinforcement on the part with the clip.