DH Russell is my main blade.  Full tang.  Perfect for whatever from cleaning fish to batoning wood.  It also spreads peanut butter nicely.
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Additionally I have a couple multi-tool type dealios.

A belt knife needn't be on your waist.  Mine is on a lanyard and is either attached to my little kit bag or around my neck.  Same lanyard has a whistle and I don't tromp without it.

A full tang belt knife is a must.  
Swiss Army knives, once the standard, haven't kept up with modern multi-tools imo.