Here's Why Some McDonald's Cup Lids Have Rectangular Buttons

Frequent McDonald's customers may notice that McDonald's cup lids have rectangular buttons. Here's why the buttons exist!

McDonald's workers reveal what all the mystery buttons mean on the drinks lids

Disposable White Coffee Cups with Lids 10 oz (50 Pack) - To Go Paper Coffee Cups for Hot & Cold Beverages, Coffee, Tea, Hot Chocolate, Water, Juice - Eco Friendly Cups

McDonald's drink lids have 'buttons' on - but why, and what do they do? - Liverpool Echo

What does the 'P'on the McDonald's soda cap stand for? - Quora

People Are Freaking Out After Discovering What The Rectangles On McDonald's Lids Are For

Why the McDonald's drink lids have the buttons pushed down - 9Kitchen

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Why there are buttons on McDonald's drink lids - Daily Star

McDonald's workers share what the 'buttons' on its drink lids really mean

Why the McDonald's drink lids have the buttons pushed down - 9Kitchen