This offer from October 2015 is still active if you missed out!
Today's free Glad to Give trash bags are part of a larger promotion centered around making donations to charities using trash bags. So … am I the only one who finds this weird? That's basically one step removed from boarding a flight with your luggage in a trash bag.
You can request
up to 5 free bags (they're only giving out single bags now!) for those of us who are extra messy and/or giving. To find the form, scroll down to the 5th circle in the lower right.
[thanks Passion for Savings!]