ONE HAND USE Extra-wide, rigid collar allows easy use for women as well as men and children EASY TO USE Simply press ends of collar bottom to open and place over mouth. For added safety, fold in collar on scored line. WON'T LEAK Inner valve automatically seals shut . Prevents contents from leaking or spilling even if dropped. NO STRINGS No strings, no twist ties necessary as in other products. Automatic seal means no spills, no clean-up, no mess, no odor.