Starbucks were served in personal tumblers brought in by customers 34 million times 2011 report issued by Starbucks 2011 report 2011 report 2011 report 2011 report issued by Starbucks were served in personal tumblers brought in by customers offer a discount personal tumblers Responsibility 2011 report 2011 report set a goal 2011 report 2011 report 2011 report 2011 report Starbucks' new goal 2011 report 2011 report set a goal 2011 report 2011 report aims to raise that figure discount if you bring your own mug 2011 report environmental goals 2011 report issued by Starbucks 2011 report were served in personal tumblers brought in by customers 2011 report Responsibility 2011 report 2011 report Starbucks In their sustainability report they write: 2011 report 34 million times Starbucks