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.
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Engraved pet tags are designed to be extremely durable so they can be read, even after tons of abuse. If you need to put a tag on your luggage, rather than using a paper or flimsy tag, an engraved tag will likely last longer. Similarly, you can use a small tag on your keys with your email address or phone number in case they get lost. Best of all, the pet tags are designed to be impulse-buy cheap, which may even save you money over comparable tags.