What I bought was the Mad Catz Microsuede Touch Pak.
The Microsuede Pak is by no means the Otterbox of protective equipment, meaning, you can't drop your system fifty feet and have it survive. While the Pak does cover the 3DS quite well, the cushion surrounding the system is minimal, and a decent drop could still [potentially] wreck your system. However, what this Pak does offer is a slim folio holster for your $249.99 handheld system and a sleeve that holds up to three 3DS or DS cartridges.
The Pak can easily slip in and out of your pocket, be it the front or the back, and the suede makes it feel nice while doing so.
To add to your purchase, the Microsuede Pak comes with two pen-sized styli, in case you have long fingers like myself.
While there is not too much that can be said about a holster accessory, if you are in the market for a slim pouch that makes for an easy grab-n-go item, the Mad Catz Microsuede Touch Pak is definitely what you're looking for.
The Mad Catz Microsuede Touch Pak retails for $14.99.