According to Jacqueline L. Salmon (Washington Post's Popewatch), if you're attending the papal Mass at Nationals Park on April 17, you'll get a gift bag when you arrive:
It will contain the Mass program, the Magnificat (daily prayers and daily Mass readings) and a Vatican flag. Our guess is that a lot of flag-waving will result.And if you're sitting on the baseball field, you get even more stuff.