Another short but important praxis from The Trainer:
Multi-Tools: One needs to be in or on your web gear. No exceptions. Too many applications for it not to be. For those who can't decide, understand this:
DO NOT buy a cheap knockoff! You get what you pay for, as with any other piece of gear you're betting your life on.
That said, here's a good site that will allow analysis of the various high quality multi-tools available today.