Boker Ti Mariner
2.8oz, serated and double edged, all titanium, skeletonized handle, 4"blade, 4" handle, used by hardcore spec opps dudes and dudettes the world over. Also...Non magnetic Titanium won't set off mines during ground probing. Balanced for throwing too!
Now that we have moved in to the "Real Knife" zone...Gonna' need a window on the bivy sack to make split second well informed night time decisions...
***Black bear, brown bear, nut case smelly thru-hiker, hiking partner after a "bad" day, etc. -Play dead, stay in the bivy.
***Polar bear, rabid marmot, BKP (bowie knife psycho), anyone naked and singing in latin, etc. -Thrust that Boker through the bivy to simutaneously stun/kill attacker and create a gaping emergency exit slash in the bivy.