We have used these for a long time to store Mazuri tortoise diet for easy access and storage. We mount them to the wall, and with an easy pull of the lever, you can get out just the right amount (no more lifting and pouring the heavy bags every time you need it). This larger bin will hold about 40 pounds of Mazuri tortoise diet (or dog food, etc). A small, clear window in the front lets you keep track of how much you have left.