Life is what you define it! This 590ml Defined Sister mug features an original definition that gives new meaning to everyday life. This high-quality, extra large and durable stoneware mug makes a perfect gift for your favourite sister to show how much you care! Dishwasher and microwave safe. Caption reads: sister?sis•ter?[ sis-ter ] ,?n. 1: a female sibling who has one or both parents in common with another?2: the one who knows your secrets and loves you anyway?3: someone who is annoying yet irreplaceable; always there for you?(see also: sis, BFF, partners in crime, closet thief, not the favorite).