I have experimented extensively with an attached horn and for the life of me the only advantage I can find is there’s only one strap to put on the hook when you put it up. There are many disadvantages, most importantly, that horn strap does not slide across your shoulder when you raise it to fill your measure. As far as bags go, think a well used unpretentious homespun, bottom shelf, or repurposed. Even when in its first season of life it would have shown wear from the many days spent hanging on a fence post, in the barn, or laying in the floor of the wagon. A southern boy did like gussied up horns and whittled on measures though….