Why do coffee cups have a second tiny hole in the lid

Why do coffee cups have a second tiny hole in the lid

Why do coffee cups have a second tiny hole in the lid

It often goes unnoticed, but the tiny second hole designed on the lids of takeaway coffee cups plays a vital role in the flow of liquid. 

Why do coffee cups have a second tiny hole in the lid

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Why do coffee cups have a second tiny hole in the lid

glass + Silicone Cover + Straw Brush + Straw + Lid) Ins Style

Why do coffee cups have a second tiny hole in the lid

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Why do coffee cups have a second tiny hole in the lid

Did you drink your coffee from a takeaway cup after removing the

Why do coffee cups have a second tiny hole in the lid

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Why do coffee cups have a second tiny hole in the lid

Paper cup - Wikipedia

Why do coffee cups have a second tiny hole in the lid

100 Pack] 10 oz Hot Beverage Disposable White Paper Coffee Cup

Why do coffee cups have a second tiny hole in the lid

What is the hole for? Does this lid even go with the cup? Other

Why do coffee cups have a second tiny hole in the lid

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Why do coffee cups have a second tiny hole in the lid

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Why do coffee cups have a second tiny hole in the lid

Got this cup as a gift, and it has a little rubber/silicon thing