Even if they haven't gone so far as to get formal self-defence training, many people (particularly women) have considered what strategies they'd deploy if they were attacked by a stranger. A popular thought is that one would use an object on your person as a weapon of defence - like keys, for instance.

We’ve all been there: you’re running late to work or heading out the door to meet friends, and in a rush you leave something essential, like your keys, behind.

The Nut Find 3 Smart Tracker keeps tabs on your must-haves, so you never forget your keys on your way out again.

If you end accidentally leaving important items at home in your rush to leave the house in the morning try stashing your keys under what you don't want to forget.

Losing your keys is the worst -- so it makes sense to do whatever you can to ensure your keys get back to you safely, should they be misplaced. For some that may mean attaching a Bluetooth-enabled location tracker, but I'd rather not have yet another bulky plastic doohickey on my keychain next to my flash drive. Luckily, the web has come up with a pretty low-tech method of ensuring your keys are returned safely. But first, you'll need to visit a pet store.

If you're tired of misplacing your keys around the house, this explosive memory trick will help you remember. All you need is a little imagination.

Get rid of your bulky key chain and replace it with the KeySmart Key Organizer. It’s great for keeping your keys neatly in place, and it eliminates that embarrassing jingle jangle when you walk. Lifehacker Australia readers can pick up the Keysmart for only $21 AUD , a savings of 27% off the RRP.

Minimalist wallets are a great way to cut down on all the junk in your pockets, but if you want to go all in, Make shows you how to make a wallet and key holder combo out of a piece of leather.

Copying some keys at the store is more hassle than it needs to be. For small padlocks and other very simple locks, you can copy some emergency spare keys with the lid of a food can.

If you've ever been to a pet store, you might have seen pet tag vending machines that can quickly and cheaply engrave tags for your pets. However, you can also use these to make sturdy tags for your luggage, or even your keys.

You don't have to be an audiophile to appreciate this DIY audio jack key holder, but it certainly helps. Mounted on your wall, you'll always have a place to plug in your keys when you get home -- and you'll know where to find it. It's easy to build, too.

If you're not careful, your key ring can quickly get out of control. Before you know it, you'll have five keys for things you don't own anymore, heaps of rewards cards and a few tools you don't really need. You can handle this situation in a lot of ways. Let's look at a few of the best.

Want to keep a spare set of keys in your wallet without them bulking it up? Grab an old credit card and a cutter, and you'll soon have a DIY key holder that keeps them together and doesn't bunch them up.

Plastic key caps are a great way to ensure you can easily tell your keys apart. If you'd like to make your own, Instructables user Andrea Biffi shows how to do it with some Sugru.

A good multitool packs a number of tools into a small device that's easy to carry with you. This DIY multi-key takes that idea and expands it to carry your keys as well.

Keys have a tendency to destroy pockets. If you're sick of carrying around your bulk of a keychain, do what Reddit user mattfrancis13 did and cut off the top of your keys to make them smaller.

Sometimes, when fumbling with your keys, you spend a lot of time staring at them to figure out which one you need. If you can identify them by touch, however, you don't have that problem. With a little Sugru, you can easily add those variant textures.

Even though I have a "spot" for my keys and wallet, I still end up misplacing them. The Lego organiser is a fun and convenient place to store all of your everyday carry things. A standard Lego base plate is stuck to a wall, while bricks and plates attached to everyday items make them attachable to the mat, never to go missing again. Here's how to make your own.

Some people like to stash a spare key to their house in a fake rock or under a potted plant. Another good way to hide a key is to build a small PVC pipe with a cap and coupler for a waterproof storage area that will look like an innocent access point to a drain.

If you're always losing your keys, you need a regular place to put them. A bowl on a side table works, but it's kinda boring. Why not make your own out of LEGO?