When it comes to your safety, you can never be too prepared. Sure you could always be strapped, but sometimes a sturdy knife might do the trick. Plus — you can’t open mail with a Heckler & Koch, can you? Smaller than a credit card, this titanium-folding knife is unassuming and at 2 3/4” closed is just enough to go undetected but capable of helping you defend yourself against someone who tries any funny business. The knife sells for $29.

The unfolded Credit Card Sized Titanium Knife after the Jump…