Because size (or capacity) matters - the 20 gallon size has the extra capacity that fits 50% more trash which means less trips taking out the trash! It is the perfect can for the largest indoor trash bag in America! Glad stainless steel step trash can is designed with Clorox protection of the lid and lid frame to prevent and block unwanted odors. Save time by storing extra bags at the rear bag compartment of your Glad stainless steel step trash can. You can easily dispense the trash bags from the sides while the can stays in place. The inner bag rings keep the trash bag secure and in place so you don't need to worry about showing excess trash bag out of your elegant trash can. With the Glad step trash can, the complete lid and frame hinge open for easy removal of large trash bags. Stainless steel waste bin provides a convenient and quiet step operation with a controlled gentle closure, and is resistant to fingerprints and smudging.