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Generally, when the box is full of liquid, if you hold it with more strength, the liquid will splash out and wet your hand. Furthermore, when we suck the soft drinks, because of the air seal, the box usually deforms badly and later rebounds after air in. Now we have a new straw like this, and in specific position there will be a small gap between box and the straw. So it can help to keep the balance of both sides’ atmospheric pressure.
NANOIN
Hangzhou, China
Gao Fenglin
Zhou Buyi