Four mugs for the size of one! The Zero Mugs nest/stack perfectly inside one another to save space in your backpack, car, or RV. No wasted space! Zero Mugs are made from food-grade, heat-resistant polypropylene. They are designed to easily withstand the heat from piping hot coffee or tea. Zero Mugs are also BPA-free and dishwasher safe! Each cup includes its own measuring scale. Great for measuring ingredients for your camping recipes. Also great for making the perfect cocktail! Quickly and easily secure your Zero Mugs to your pack using the included wire carabiner. Zero Mugs fit a set of four full-sized mugs into a small (5.5" x 4.25" x 3.5") and lightweight (10.7oz) package. The largest mug fits a full pint!