This used hardcase is the classic rectangular model. It is Futozao/Tsugaru Shamisen sized, but of course smaller shamisen will fit as well. There’s some slight discolorations on the inside (see photos).
Not having to take your instrument apart to transport it is a huge game changer, because you’re always ready to whip out your shamisen and play. Keeping your instrument assembled means it practically stays in tune. The hard shell keeps your instrument safe from people, doors and sneaky corners attempting to bump into your shamisen.
The calm blue felt lining and the classic black outer shell make a cool and smooth combo.