Reddit mentions of BOKER Plus 01BO010 Credit Card Knife with 2-1/4 in. Straight Edge Blade, Black

Keep in mind that the Sinclair is pretty cheaply made.

Boker makes some pretty small knives, and are much better quality. I've handled this one and was impressed. Its not small enough to keep in a wallet, but it will actually be usable as a knife. They have a smaller one, but it's less solid and less functional. Most "credit card" knives are gimmicky.

For a small fixed blade, check out the gnome.

Another link for the lazy

Me too. Remember to do your best to be safe:

-Keep your car filled with gas

-Keep ani-freeze & oil in your trunk

-Run flat tires are great

-Park in well lighted areas

-Keep your phone charged

-Keep a cigarette lighter adapter USB charger & phone cable in your car

-Keep your phone password protected, screen dim, and phone in your hand when alone at night

-Let a friend know your location, use Find My Friends

-Take a selfie Defense class

-I keep a credit card knife in your purse

-Listen, look, and feel your surroundings

Yes! Credit card knife. I got it yearsssss ago. I love it, however, mines pretty dull... and it's kind of flimsy. The flimsiness may be my own fault though as it has been carried in both my wallet and key holder at different stages in my life. I would venture to say it's a bit loose on the hinge the knife swings out on and isn't exactly the most sturdy thing once it is "unsheathed" - however, it's perfect for me because all I ever use it for is opening letters/boxes/etc. I do wish it was a little less flimsy on that hinge, but I've been pretty lazy about trying to fix it - maybe I'll do that in the morning! :)

Boker Credit Card Knife: http://www.amazon.com/Boker-Plus-Credit-Card-Knife/dp/B00365NKL2

On this same trend, I have a Boker CC knife in my wallet at all times.