Your keychain is one of the two or three things that you almost always have close at hand, and there are a lot of tiny accessories you can add to it that'll make far more useful, without adding much bulk.
You might not want to attach a full Gerber multitool or Swiss Army Knife to your keychain--bulk aside, it's likely to get confiscated the first time you accidentally bring it to an airport or sporting event--but there are smaller, more limited tools that do make sense to attach next to your car keys.
The Gerber Shard is a personal favorite of mine, and makes it incredibly easy to tear through packing tape, open bottles, and even turn screws in a pinch, all for about $6-$7. I've owned the black one for a long time, and not for nothing, it's developed a nice patina after rattling around in my pocket with my keys for years.
Marlboro & Kane's Claw can technically do nearly anything the Shard can, albeit not as easily. But the single piece of titanium is smaller than the diameter of a penny, and is easily the smallest multitool you'll find.
Chances are, you own a portable USB battery pack that you carry around whenever you travel. But if you forget to bring your charging cable with you, it's not going to do you any good. Luckily, there are a variety of charging cables out there that are designed to clip onto your keychain for emergency charging, and we've rounded up some of our favorites over on our sister site, The Discoverer.
If you ever carry a bag with you, be it a purse, a briefcase, a backpack, or even a grocery bag, Clipa is an ingenious little ring that lets you hang it from any flat surface, rather than setting them on the ground. It might seem excessive, but it'll become one of your new favorite things the first time it keeps your bag off the floor of a public restroom.
Clipa may be a little large for some key rings, but if you usually carry the same bag, you could also just clip it to the bag itself instead.
Orbitkey isn't a tool in and of itself, but it does organize your keys into a multitool-like arrangement. Once you add your keys to the leather Orbitkey (I also keep my Gerber Shard in there), you can pull them out as if they were individual blades in a Swiss Army Knife. That makes it easier to keep your house key out while you're carrying groceries, and means they won't rattle around in your car or in your pocket.
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