Sistema Plastic Microwave Steamer Bowl (Small) (Red/Clear) Microwave steamer bowl. Choice of 3 sizes: Small (1.4 Liters), Medium (2.4 Liters) & Large (3.2 Liters). Simply add water to the bottom of the container, add your veg to the removable steamer tray and then place the container in the microwave. 4 Stay Cool clips on the lid, making the container easy to remove from the microwave when hot. Pressure release vent on lid.