Probably the blades I use the most - for the mundane task of opening packages, envelopes, boxes.
I had been using the little CRKT Folts Minimalist Wharncliffe at our incoming package counter. I loved the blade shape so much that I stepped up to a bit beefier Wharncliffe - the Cold Steel Tuff Lite.
The Tuff Lite handle had some sharp edges which I beveled slightly with some sand paper. The lock spring on it is incredibly strong - it could be a good bit weaker for easier operation, but at least there is NO chance of that blade
ever closing inadvertently from your hand pressure on the handle, no matter how tightly you grip the knife.