That mug will hold a gallon. Empty, it weighs a pound or two - about all I can really lift with my left arm before I start feeling some pain. Full... Forget it. It will be two handed mug only.
I bought the mug, years ago, and Starbucks provided the stickers. With the exception of the bag of 100% Kona Starbucks Coffee over my right shoulder, everything else with the logo on it was provided by the Company. They also give me a pound of coffee each week, and I can drink whatever hand-crafted beverage I want, free, on my breaks and before/after work.