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Why use a straw at all instead of just drinking directly from a drinking glass, thus avoiding the need to wash and manage the straws?

Also, glass is a better material than steel for food applications, and glass straws exist, so they are probably a better choice (unless there's a significant chance of breakage like giving them to small children).

That's my question too, why is the straw in every day life necessary?

What about milkshakes and frappucinos? These would be awkward without straws. (And frappucions are a huge seller to the 14 - 20 yr old demographic)

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