Beyond safety, this hole plays a very real role in the proper functioning of the pen. When writing, the pressure inside the cap must remain balanced for the ink to flow smoothly.
Without this small opening, air doesn’t circulate properly. As a result, the ink can bleed, dry too quickly, or stop flowing altogether. The hole acts as an invisible regulator, ensuring a smooth and consistent line. Like a small, discreet, but essential valve.
And as a bonus: by promoting this good balance, it also helps to extend the pen’s lifespan. Practical, isn’t it?
A clever move for manufacturers
It’s not always obvious, but designing hundreds of millions of bottle caps represents a considerable industrial cost. Every gram of plastic saved counts.
Thanks to this small opening, manufacturers use less material, speed up the molding process, and reduce production costs. Good design is also about this: thinking about the user AND the production line. Efficient at every level.
When technique becomes signature
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