Leatherman Skeletool CX
First off I have the CX version, which isn't really that different from the normal version except for the carbon inserts, and the partially serrated blade. They both weight the same though, so I bought it mostly for the serrated blade, which comes in handy if you need to slice webbing or rope quickly. Some people like a tool with more functions, but if you are really going into the backcountry you will probably bring bigger tools. The functions on here can do a large number of functions. I can do all my binding repairs, or most gear repairs during day trips skiing with just this.