The Life-Saving Secret of the Pen Cap
If you’ve ever put a BIC pen in your mouth, then you more than likely chewed on the pen while thinking (we’ve all been there), you’ve probably noticed a small hole at the very top of the cap. Most people assume it’s there to keep the ink from drying out or to balance air pressure.
The truth is much more heroic: That hole is there to save your life.
Design for Safety
In the early 1990s, the pen giant BIC introduced this design feature, and most other brands followed suit. Why? Because pen caps are one of the most common items accidentally swallowed by children (and distracted adults).
How “Pen Cap Holes” Work
If a pen cap gets stuck in someone’s windpipe, the airway can become completely blocked, leading to a life-threatening emergency. The tiny hole at the top ensures that:
Much-needed airflow continues
Even if the cap is lodged, a small amount of oxygen can still pass through the hole.
Buying time “Emergency Vent”
This “emergency vent” provides just enough air to keep the person breathing until emergency responders arrive.
A Lesson in Universal Design
This is a perfect example of Universal Design when a small, inexpensive change to a product makes it safer for everyone without changing how it works. It’s a tiny hole that most of us never notice, but it saves hundreds of lives every year.
TechRater UK: Did You Know #04
Questions People Ask
Do all pen caps have this hole?
Most reputable brands (like BIC or Paper Mate) include it on any pen that has a detachable cap. “Clicky” retractable pens don’t need them because they don’t have a cap that can be swallowed.
Does the pen cap hole make the ink dry out faster?
No! Engineers designed the inner seal of the pen to protect the nib. The hole is on the outer shell of the cap, so your ink stays fresh while your airway stays clear.
What should I do if someone swallows a pen cap?
Even with the hole, this is a medical emergency. Call emergency services immediately. The hole is a safety buffer, not a permanent solution!
