BruMate BackTap 3 Gallon Backpack Cooler, BlushMeet BackTap. The world's first stainless steel lined, leak resistant, backpack cooler with a tap. Designed to be small enough for most tracks and events, but big enough to carry everything you need for a day of fun, while making hauling your drinks a breeze. Holds 3 gallons of your favorite adult beverage, 14 slim cans (White Claw, Truly, Michelob Ultra), 12 standard 12oz beer cans, or 5 bottles of wine.