Thin Blue Line Tumbler 30oz. This durable thermally insulated tumbler is the perfect gift for the overworked officer who needs their coffee. Begin your mornings feeling great knowing that every purchase helps support police families across the country. Specifications for Thin Blue Line Tumbler: Manufacturer: Thin Blue Line Container Volume: 30 oz Package Contents: Thin Blue Line Tumbler Thin Blue Line TMBLR-TBL-30OZ: Tumbler 30oz