I carry a knife with me everywhere I go, unless I expect to go through a metal detector. What if I can't carry my knife, but I don't want to be completely helpless? The Gerber GDC Hook Knife has saved me in several awkward situations. It features a non-threatening design (no stabby bits, no risk of hacking or slashing) but keeps a tiny sharp edge inside its hook. I've used it to cut through twine, string, card stock, cardboard, and perhaps most importantly, packing tape. This little thing opens boxes like a pro. It will even get you into those awful plastic clamshell packages, without the danger of stabbing yourself in the privates with a big knife.
Far too many times, I have seen someone ruin a ball-point pen trying to open a package. even worse, they use their keys like a knife to cut the tape, which can coat the key in adhesive residue. That's not the kind of thing that belongs inside a lock. Worse still, I've seen people open up a pair of scissors and hold them awkwardly, using one blade as a knife, while trying not to use the other blade as a handle. It's madness! This Gerber Hook Knife makes it easy to open packages, using a tool for its intended purpose.
I've kept this Gerber for longer than I can remember, and it's never let me down. But I'm considering a switch to the GDC Zip Blade. I'll let you know how it goes.