Yep. An old pillowcase and the tassel cord off one of my sword bags. Does anyone else do this too?
Yep I use this on my nagauta. You can use 2 pillowcases and make a full fukaro. =) Heres what mine looks like.
Hmm… I might try that. I wanna make a full fukuro with shoulder straps so I can wear the shamisen on my back lol
Haha! Oh my, that actually looks quite professional! 
Good thinking!