The Roll 'n Pour provides help pouring liquids from gallon jugs, half-gallon jugs and two-liter bottles. One device cradles all 3 of these sizes. It provides pouring for children, seniors and those users who have arthritic hands or wrists and limited use of one hand. It is easy to use. Just set the container in the cradle and tilt it toward your glass. The Roll 'n Pour does the rest.