This is a Magpul Industries Pouch known as the DAKA Suppressor Pouch, model MAG875-001.
The Magpul DAKA suppressor storage pouches" constructed the same as our original DAKA pouches" the newest models are size optimized for storage of firearm sound suppressors and their accessories. Rugged and easy to clean" they are ideal for storage or transport of your suppressor along with your NFA paperwork. The Small pouch accommodates Rimfire cans. Made in the U.S.A.
Features:
YKK Aqua Guard® water resistant zipper
Small Pouch size overall dimensions: 9.25x3
Zipper opening: 6.5";Carabiner attachment points