Some things that are appropriate to include in a goody bag for a 13-year old are books, chocolate, stress balls, cosmetics and tie-dyed clothing. The contents can be altered so that they fit the theme of the birthday party.
If a party includes watching movies, a goody bag can include popcorn, candy, soda and gift card to the movie theater or DVD.
A party that involves makeovers or a spa day may give out a bag with makeup, nail polish, lotion, skin care items and beauty implements.
For a sports-themed bash, fun contents for the goody bag are a small sports souvenir, sweat bands and sports drink.