system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do plastic bags make so much noise?
gpt
Well as far as i know, its because the polymers are stretched and crystalized to make the bag cheap and sturdy. This makes it more resistant to physical manipulation and when you overcome the resistance when you change the shape, the energy is released as sound.

**eli5: Sound is vibrations. Crumpling a plastic bag releases vibrations into the air.**