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the lid fit securely over the cup. Raised sections and channels can also influence how liquid moves toward the drinking opening.
Not every lid uses the same arrangement. Some have a separate vent hole, while others use a different combination of openings and molded features.
Does the Tiny Hole Prevent Spills?
It can help with controlled drinking, but it isn’t a guaranteed spill-prevention feature.
A vent hole is primarily related to airflow and pressure. The drinking opening, lid fit, cup design, and the way you carry the drink all affect
