Each Jar comes with a sifter seal. A 20gram jar will hold approximately 10-11 grams of product depending on the weight of the actual ingredients you put in them. This listing is for an empty jar. One jar is $.2.00.
The jars stand up to being dropped and banged around pretty well. I think one might have broken after being dropped for probably the 50th time on tile. It lasted a couple years and the way I abuse them it was bound to break eventually. The threads line up easy so you open and close it easily. The shaker insert works well to manage how much product comes out. It is easy to pop out the shaker insert and refill it and stays in place.