2. Pressure Regulation
The hole also helps balance air pressure inside the pen.
Without the hole, trapped air could cause ink to leak or blot.
With it, the ink flows more smoothly when you write.
3. Standardized Design
Most major pen companies (like Bic) now include it as a safety requirement.
Over time, it’s become a universal feature—so common that many of us don’t even notice it anymore.
Final Thoughts
That tiny hole isn’t just a random design—it’s a life-saving, practical feature that millions of people benefit from every day without even realizing it.
👉 Next time you pick up a pen, take a look at the cap. You’ll know it’s not just there for style—it’s there for safety.
