Was talking to some of my new friends in Serbia airgun forum, and just ran into one of these posts. You don't need a translator but you can see from the pictures what the guy is making and selling over there...
https://airguns-srbija.com/forum/threads/p-torbe-za-puske-i-ostalu-opremu.2485
https://airguns-srbija.com/forum/threads/p-torbe-za-puske-i-ostalu-opremu.2485