Grab your sledgehammer and go! This USMC breaching tool carrier will help you bring along your breaching shotgun, bolt cutters, Halligan bar, and such. Some of those things might even fit there simultaneously. This is a one-off lot of unused US military surplus, get yours now!
This piece of gear is a part of the US Marines FSBE (Full Spectrum Battle Equipment) system. The carrier has an open top, and the main (and only) pouch has a plastic reinforcement to shield the fabric from wear and abrupt damage. The main pouch has a full length integrated tubular holder for elongated things (max diameter about 40 mm / 1.6"). The main pouch also has an adjustable flap on top, most likely to secure things like a shotgun while doing some dynamic USMC moves.
Apart from breaching tools, this carrier can also be used for carrying any object that fits, such as a tripod for photography operations or sniper shenanigans.
These carriers seem unused – new old stock from the US of A!