Credit Card Knife - Tactical Folding Knife by Muzitao©

The knife as it would be in your wallet
with a Bic pen for size comparison.

This is one of the most creative little gadgets that I have ever held in my hand. The premise is simple - a knife that folds up to the size of a credit card (actually the width of two credit cards) so you can carry it around in your wallet.

First, flip the blade...

A pocket knife is a handy thing but you can't always carry one around. This knife, though, is so easy to carry around that you can forget that you are carrying it because it's tucked right in there with stuff you literally can't leave the house without - your money, your charge card and your driver's license. 

Lock in the two parts of the folding
handle...

To use the knife, take it out of your wallet, unlock the blade and then fold the blade back over the card. Then, you flip and lock down the two pieces of the handle and you have your knife.

So, how good is the knife? This blade is very, very sharp. I wouldn't want to use this knife for a lot of cutting - you are not going to filet a fish or do a lot of

The knife, assembled.

whittling with this knife. This is strictly for convenience. Now, keep in mind that I mostly use it for opening up those annoying clear plastic packages that are so hard to get into and for breaking down boxes and the like, but this knife is super-sharp - impressively so. There is a finger guard but it is not very substantial. 

I rate this knife 5 stars out of 5 for its simple convenience. 

Click here to check current pricing at Amazon.com: Black Credit Card Knife (Silver Blade) Best Tactical Folding Knives by Muzitao©
Note: I received a sample to test in exchange for an honest review.