Guys, prepare your tumbler! Tomorrow (Apr 22), Starbucks Thailand is offering a free latte beverage for every customer who bring their own glass. The glass/mug/tumbler must be no larger than 20oz. (591ml), though. Redeem your free drink at Starbucks branches nationwide (including Suvarnabhumi Airport) 10am-noon on Apr 22 only. For the rest of the day you can also get a B10 discount for any beverage if you bring your own glass.