Use It And It's Fat

Riddle: I'm flat when I'm new. I'm fat when you use me. I release my gas when something sharp touches me. What am I?

Answer: A balloon.

Source: https://www.riddles.com/index.php/3445

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I'm flat when I'm new. I'm fat when you use me. I release my gas when something sharp touches me. What am I? — Use it and it's fat by BlackDuckyChimp1679 v1.

Riddle: I'm flat when I'm new. I'm fat when you use me. I release my gas when something sharp touches me. What am I? Answer: A balloon. — by BlackDuckyChimp1679 v2.