This heavy duty straining bag has hundreds of uses around the kitchen and home. It is ideal for filtering liquids and removing solids and other impurity. The perfect size mesh is very easy to get pure liquid without any pulp or particles getting through. The bag can be used to filter hot liquid and boiled for a little time (not recommended for a long time). Some tips: When the bag comes out of the package, it is a flat rectangle. The specifications of size is the length and width of the rectangle. So twice the width is the circumference of the bag mouth. Take the 25.39 "x 18.89" bag for example, it has an opening about 37.78" (18.89" x 2) in circumference. Choose the bag according to the container currently using. Usually the diameter (or circumference more precisely) of the container determines the size of the bag. Take a standard 5-gallon container for example, it typically has a diameter of around 11.7" and its circumference is 37". The 25.39 "x 18.89" filter bag is 37.78 "(18.89" x 2) in circumference, so could try it. Of course, the thickness of the container is also important that it directly determines the maximum opening diameter. Package Included: 5 x Nylon food straining bag with string