Small pouch for carrying elk calls on shoulder strap?

[hogslayer]

i have seen these on some packs but can't seem to be able to find them.  It's a small pouch that attaches to the shoulder strap and holds diaphragm calls.  Does anyone use these or know what I am talking about?

[RadSav]

I haven't liked most of the diaphragm call cases out there.  Only two I've really liked were the old vinyl coin purses and M.A.D. calls lanyard case.

Last small pouch for the pack I liked was found at the Dollar Store.  I also like the tiny Swiss Gear cases you find in the electronics department at Fred Meyer.