Any serious outdoorsman will tell you: "You are only as sharp as your knife."
A good, all purpose blade is the best survival tool you can bring in the wild.
If, like me, you sometimes happen to end up quite far from civilization, you might want to take advantage of all the R&D that was made by the elite of the elite in terms of survival: The U.S. Navy Seals.
The knife they use has been developped by SOG and it truly is a masterpiece. Unsurprisingly, they call it the Seal Knife.
There are numerous small details that distinguises it from ordinary blades, but just take a look at the groove in the sheat, to cut rope without having to draw the knife. If you happen to be at sea in rough weather on an inflatable raft, this might just save your ass.
For those interrested, you can buy this knife at Le Baron on St-Laurent in Montreal.