Part of the X-Series of lightweight camping dinnerware from Sea to Summit, the X-Cup and the larger X-Mug are made from flexible, food grade silicone that is collapsible and packs down flat. A rigid rim holds its shape and provides a comfortable grip for handling hot liquids. Calibrated internal ridges also serve as a measuring cup. Food grade silicone is heat resistant, dishwasher safe and ideal for camping, backpacking, travel or lunch boxes. X-Cup capacity one cup (250ml), weight 1.6oz, diameter 3.75-inches. X-Mug capacity two cups (500ml), weight 2.1oz, diameter 4.5-inches.