Hey Folks, don't get me wrong about the munter-hitch. It was only recommended as an alternative to carrying the small micro belay device mentioned. If your PSK is small and you have to choose between a micro belay device and a map or compass or more first-aid and you don't even have a line or rope on you, carry your belay device in your head in the form of knowledge.

I use both the Reverso and Sheriff as my primary belay devices. They are in-line devices the don't twist the rope as it feeds through and accomodate double ropes of different thicknesses.

A note on double ropes of different thicknesses. If you are double rope rappelling, the thinner rope with move through the belay device faster so the knot connecting them at the anchor should be on the thin rope side of the anchor so the thin rope doesn't creep up on you leaving you short and facilitating a fall or stalling you a you encounter the knot you tied in the end of the thin rope before you encounter the end of the thick rope. You can fix this problem on rapel most of the time but an ounce of prevention,... yada yada yada.