When this product arrived, I was pleased that it was so carefully packaged, including a hard cardboard "O" ring to protect the "pop" function. I decided to wash the item and after carefully reading the instructions, I determined that it would be best to start with a hand wash. Once dried, I filled the container with granulated sugar. The container has a nice, air tight seal and holds a lot more sugar than my previous container, but there are some flaws. As a heavy baker, I often need quick access to my sugar. The sides of the container are not easy to grip and because of the shape of the opening, it was not easy to scoop using my measuring cups, . If I tried to invert the container, my fingers became instantly fatigued. I think the container would be perfect if there were silicone grips on the side. In the end I give the product 4 stars and would probably use the container for pasta or something that I wouldn't need to use frequently.