Zippy bags are great for that! I used to take one to cinemas to put any bought sweets into as those cellophane bags are so bloody noisy.* (I don't buy sweets now.)
* Damned woman next to me in Peter Jackson's They Shall Never Grow Old annoyed the hell out of me with a bag of crisps.
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* Damned woman next to me in Peter Jackson's They Shall Never Grow Old annoyed the hell out of me with a bag of crisps.