Large insulated bottles
Sports drink containers
Water bottles with carrying loops
Disposable coffee cups
Fountain drinks
Manufacturers design cup holders to be as versatile as possible.
The notch helps accommodate containers that aren't perfectly cylindrical.
Some Gaps Have Multiple Uses
Depending on the vehicle model, the gap may also work alongside flexible retaining clips.
These clips gently grip the sides of a cup while allowing slight movement as different-sized containers are inserted.
The opening gives those clips room to flex.
Without that extra space, larger cups might not fit properly.
Engineers Think About Everything
Many people are surprised by just how much thought goes into something as ordinary as a cup holder.
Automotive designers test cup holders using hundreds of different containers.
They consider:
Diameter
Height
Weight
Material
Handle placement
Driving vibrations
Sudden braking
Cornering forces
The goal is to keep drinks upright under as many conditions as possible.
Why People Never Notice
The funny thing about everyday objects is that we stop seeing them.
Once we become familiar with something, our brains often ignore small details.
That's why people are frequently surprised when someone points out a feature that's been sitting inches away for years.
