An ammunition box or cartridge box is a container designed for safe transport and storage of ammunition. It is made of SRF and labelled with caliber, quantity, and manufacture.
All Hopper covers are sewn with matching color thread and black bias. Made from a custom fabric called SRF, a foam with polyester laminated to both sides. All hopper covers can be flipped inside out for an all black cover. Newer generations will have black thread on the inside.