Surprised to find that the Pull and Go case will hold a Vita with the Muramasa case on it. You have to wrap the top flap down and push it to the velcro, but it works.
The Muramasa case is a Hori Face Cover, my favorite Vita shell. I really like the way the Face Cover snaps down over the screen to protect it when not in use, or hinges up for easy play (and hinges back to change the cartridge). I use Hori Face Covers with Sony Travel Pouches for both my Vitas, and I also use Travel Pouches for several of my PSPs. System+Face Cover fits perfectly in the pouch, with room for extra cart games, USB cable, etc.
Unfortunately the Face Covers seem to have become somewhat scarce, though getting it with the Muramasa Collector's Edition is a nice bonus. I kind of wish I had bought that when on sale half off at Amazon, but I already had the standard game on cartridge.