1999-2018. RoFo Enterprise, Corporation in lieu of Randall D. Flann. All Rights Reserved. Substance Dispensing Headgear; U.S. Patent number 5966743, RoFo Headgear and RoFo BevDisHeadgear are protected under http://www.uspto.gov [or See the Patent]. Warning; any commercial use or duplication of these patented products without prior licensing is forbidden by federal law. Violators will be subject to civil and/or criminal penalties. RoFo Headgear and RoFo BevDisHeadgear are made of lightweight, food grade quality plastic. Each empty unit weighs approximately 1½ pound... Filled, equals about 2 liters, 67.6 fl oz., equivalent to 5½, 12 fl oz. glasses of beverage, weighs around 4½ pounds.