This is kind of a neat idea. I like the color on the 4th page - not the purple one though.
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I had a local seamstress make one for me several years ago; I use it exclusively unless I need to carry two bows (rarely). Great protection for the bow and one fewer case to carry. Velvet/velour material on the outside to protect the finish; satin-type material on the inside to let the bow slide in and out easily (doesn't catch rosin). You could make one to carry two bows if you put a divider inside. The tailpiece prevents the case from contacting the pickup wire.