The X-Mug is a collapsible camp mug with a 480 ml capacity that is also calibrated as a measuring cup. It features food-grade, flexible silicone sides and a rigid ring within the rim to keep it sturdy and easy to drink out of, while still allowing it to collapse into a flat disc for compact packing. This unbreakable mug is heat resistant, BPA-free, and nests with other X-Series products. Volume is 480ml.