goody bag

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A bag containing candy, small toys and other goodies handed out as a thank you gift to guests at a children's party.
• noun A bag (or just a napkin) containing leftovers (like cake or crackers) from a children's party.
• noun A bag containing gifts and promotional material handed out at a conference, exhibition or similar event.