Have you ever wondered why pen caps always have a small hole at the top? It turns out this tiny detail serves several clever purposes that most people never think about.
The most important reason is safety. If someone accidentally swallows a pen cap, the hole allows air to pass through, preventing suffocation. This simple feature has been a lifesaver in emergencies.
But that’s not all—the hole also helps the pen work better. It equalizes air pressure inside the cap, which stops ink from leaking or drying out. For manufacturers, the hole means using less material and speeding up production, saving money on every pen made.
Some companies even use the hole as part of their brand’s design, making their pens stand out. What seems like a minor detail is actually a brilliant piece of engineering that makes pens safer, more reliable, and more affordable.
