Some of the barriers in lugging around your reusable cup is the fact that they take up so much space! Fortunately, this Collapsible cup is everything you need to take that step into sustainable living and cut out single-use cups and plastic from your life, and the earth's landfills. When in use, they expand into a cup and collapse into a disk when not needed. Simply keep one in your bag, and watch the difference it makes to eliminate unnecessary waste. A true side-kick to ecofriendly living!