A small knife is one of the most useful things you can take with you. If it's small enough, you can even hang it on your house and car key – or use it to hold those keys yourself.
There is a remarkable variety of knife designs, and keychains are no exception. Here are ten of the best we could find.
The Best Keychain Knife: KeySmart Dapper 1
If you want a blade more than anything, along with a classic, but the compact stainless steel design is durable and does not attract any attention. The blade can be folded down to 2.5 inches and comes with a wide loop that can be attached directly to keys or a ring. It is also surprisingly light at about one ounce, not to mention the very affordable price.
For those who appreciate the classics: Victorinox Swiss Army Classic SD
The original Swiss Army knife has been around for over a century, thanks to its compact design and versatility. The durable Classic SD model is small and light enough to hang on your keys while keeping a small blade, scissors, nail file, slotted screwdriver, tweezers, and toothpick under a gram in weight. It is available in over a dozen colors and finishes.
For the thinnest possible blade: SOG key fob
If you exceed the absolute minimum thickness of your keyring knife, SOG has been producing incredibly thin folders for years. This includes an integrated easy-open key ring and a bottle opener on the opening mechanism. A special highlight is a user adjustable tension spring.
For a reliable fixed blade: Tonife Full Tang Neck Knife
If you need knives with more stability and reliability, you can not rely on folders. The fixed Tonife blade is less than 5 cm, but has a sturdy textured handle and a protective cover made of sturdy Kydex material. Keys can be attached to the large ring on the handle so that most users have enough space to get a good grip.
For a sturdy folder: Kershaw Cinder
Kershaw pocket knives are among the best sellers on the market, and with good reason: they are reliable and offer excellent action. The pub model includes a loop for sticking to the keychain and a bottle opener-slotted screwdriver thing with a short straight blade reminiscent of a box opener.
For a subtle hidden tool: More Classic Keychain
Sometimes it's not good to advertise. This keychain in carabiner style hides a small folding knife and a bottle opener / a file / a screwdriver in Swiss army style in a steel case. It is surprisingly good for such a cheap product. Just leave it at home, where knives like airports are completely prohibited.
For a thin serrated blade: MAXERI Knife
If you often cut hard ropes or similar materials, you will need a serrated section on your knife. This little blade has a gearing and its minimal frame is light enough for a blade of about two inches. The blade snaps into place on the frame and you can take a pocket clip with you if you do not like the keyhole.
For discretion: Porter Key Knife
This tiny knife hides between your keys and folds out on a rigid hinge box. When folded, it contains a handy bottle opener. This is another one that has to be deducted from your keyring on the way to the airport. The manufacturer provides the knife with a high-quality cable key ring.
For the smallest possible folder: Gerber GDC Zipper Blade
This thing is so small that you barely know it's a knife, but it's a fully functional folder of a reliable brand. With a size of less than 0.7 inches and a frame-lock feature, it's a great little tool when you need the very smallest thing that's possible. Note that the key loop is made of fabric so it is less reliable (and more likely to be lost) than the other knives on this list.
For Maximum Flexibility: Leatherman Squirt PS4  This flexible Leatherman tool offers an impressive array of folding features. "width =" 1000 "height =" 1000 "data-credittext =" Leatherman "src =" /pagespeed_static/1.JiBnMqyl6S.gif "onload =" pagespeed.lazyLoadImages.loadIfVisibleAndMaybeBeacon (this); "onerror =" this.onerror = null; pagespeed.lazyLoadImages.loadIfVisibleAndMaybeBeacon (this); "/>
This double-folding tool includes the standard 1.6-inch pocket knife as well as small pliers, scissors, wire cutters, and multiple files and screwdrivers it's one of the heavier and more extensive options on this list, but no other tool can do so much with so little storage space. It's available in red, black and blue.