You never realize how much you need a pen until you don’t have one. Whether it’s jotting down a million-dollar idea or catching someone’s phone number before they lose interest, not having one is a real buzzkill. This keychain pen fixes that problem forever.

And get this: it writes with titanium, meaning it writes on any surface and is inkless, smudge-free, and capable of writing underwater — because you never know when a mermaid might give you her number. The ForeverPen™ is only $23.99 here (reg. $40).

With this 1-inch-long gadget on your keyring, you can do more than write. It’s so durable that it can withstand fires, so you can use the keyring multi-tool to open Amazon packages, mark wood surfaces, clean your nails, cut lightweight cords, and maybe even strike up a fire.

Grab this small EDC tool to always have a pen and other tools handy while it’s only $23.99 (reg. $40).