Roasting and steaming - both are possible: The Toppits 2in1 Roasting Bag is ideal for preparing flavorful, vitamin-preserving meals without added fat in the oven. Gentle steaming in the microwave is also hassle-free. The practical Toppits OptiVit valve seals the bag and regulates the steam. After cooking, the bag can be easily removed from the oven or microwave, as the foil edge of the roasting bag does not get hot.