While a quality MT should come with an equally sturdy sheath, we all know this isn't always the case.

I use a Spec-Ops brand single sheath as metal snaps have always lasted longer (for me) than a velcro closure. Plus, you can wear it vertically or horizontally on your belt/pack/etc. and is MOLLE compatible.

The snap flap itself also allows for adjustment (velcro on the inside) so that it will securely hold more than one size MT (or pistol mag, flashlight, etc.).