I recently picket up this little best. It's is a Gerber Gear 30-001691 Key Note Compact Keychain Knife. It has a one Inch blade, and as you can see comes in my favorite color, black. Now this is a little chunky for a keychain knife, I am not sure I want this on the zipper of my anorak.
The blade is nominally 1" but as you can see from the pic it is a little irregular in shape however it has 2 cutting edges and really feels more like chisel than a knife. For cutting up boxes, opening Amazon packages and other types of packages, it works really well, and is very sharp right out of the box.
I like the knife and it is a good addition to my collection, but I am not sure where this would fit in real life. Maybe hooked to a pack or belt as a last ditch emergency knife perhaps but even then, there are better options. Good solid knife though.