About this item The X-PAC 20-ounce Double-Walled T304 Stainless Steel Vacuum-Insulated beer mug is a rugged beer mug that keeps your favorite beverages cold all day long. Providing maximum insulation, our beer mug keeps your favorite beer at the perfect temperature for as long as possible. Featuring a satin T304 stainless steel finish, laser welded handle, 20 ounce capacity and a tight spill-preventing lid, this beer mug cup weighs in at mere .75 lbs.