You can use the Solis Fresh Food Bags 30 x 40 cm (50 pieces) with the Solis Vacuum Systems. You use the fresh food bags in combination with a vacuum machine to keep food longer. A package contains 50 bags of 30 by 40 centimeters. Because the bags are already in size, all you have to do is place your food in the bags. Vacuum your product of your choice at the touch of a button.Cook your vacuumed meal in a special sous vide pan to 100 degrees. Do you use an ordinary pan? Then keep an eye on a kitchen thermometer that the water does not get hotter than 75 degrees Celsius. Otherwise the plastic bag melts against the hot walls of your cooking pan.