Big mug energy, lid included. The Big Bertha Mug is a 16oz insulated stainless steel coffee mug with a push-on lid and slider opening — perfect for sipping while you scroll, type, or stare into the middle distance. Double-wall vacuum insulation keeps your morning brew at coffee-shop temperature for hours, the food-safe stainless interior won't pick up flavors, and the sassy sayings on the outside make sure everyone around you knows exactly what kind of day it is. BPA-free, dishwasher safe, fully unbothered.