That's the famous harmonica pouch, frogprince, the only one like it in the world. I call it the "Pineridge Girl", after Buffy Sainte-Marie. It holds the 8 keys of harmonica that I usually need for the stuff I play (A,B,C,D,E,F,G, and Bb). I drew up the design for it back in the 70s, went to the local shoe repair guy, and had him do me up the pouch, using a harmonica to model the size of each pouchslot. It's a great stage accessory, because it keeps the keys in proper order and right where I need them for a quick change.

The original one finally fell apart some time in the mid-90s, so I had another made at that time, and it's still going strong.