A simple lid serves more purposes than one might see at first glance. Not only does it help prevent annoying spills, it also helps insulation, strengthens the cup, holds the straw in place and indicates the flavor in the cup.
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Keeps drinks carbonated
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Snug fit strengthens the cup
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Straw slot for easy straw insertion
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Ultra-clear PET lids showcase the beverage inside the cup
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Flavor identifiers indicate content of cup