The two horns take up 90% of the space inside the bag, so I wouldn't risk trying a third

That brings me to the first major advantage of this gig bag: Although you trade off the protective qualities of a hard case, this gig bag is much lighter and still offers adequate padding to protect the horns from light to moderate bumping and bruising

Pack it carefully (as in, sloooooooowly so as to not knock horns together while packing).The mute bag is currently holding a bucket mute, cup mute, straight mute, and a harmon