Can anyone help me understand "goodie bag" culture?

Posted by Party_Midnight3476@reddit | AskAnAmerican | View on Reddit | 214 comments

Hi,

Lately, my kid has been bringing home goodie bags from friends' birthday parties, YMCA basketball classes, and other events.

Since I didn't grow up with this culture, I'm curious: what exactly is the main purpose of giving out goodie bags? Also, when it's my turn to host or prepare them, what is a reasonable budget or standard "common sense" amount to spend per bag?

Any advice on what to include would be greatly appreciated!