Daily carrying a utility knife is a bit of a newer trend, especially for the utilitarians out there. A utility knife can be both sledgehammer and scalpel -- they're insanely sharp and can handle some of the roughest cutting jobs. And when you dull or break a blade, it's not that big of a deal. Just buy another 100-pack to $10 (or go ceramic).
The problem with utility knives are often how bulky or unsightly they can be. Enter the Maker Knife. It's a retractable utility knife that's just 7.7mm thick. It's made of a corrosion-resistant stainless steel and aircraft aluminum. And it has a seemingly magic locking mechanism that lets the blade slide freely when your finger is in the loop but locks in place when the blade is extended.
Oh, and it doesn't include a bottle opener.
Maker Knife is fully funded on Kickstarter with 23 days left to go. You can claim one for yourself before the campaign ends for around $45 plus shipping. It'll set you back $63 if you want it bundled with three ceramic blades or $87 if you want a custom stamped model from Jimmy DiResta. They're expected to ship in October.