The Gleason Collapsible Milk Crate Truck will help you easily take four of your fully loaded milk crates just about anywhere you go. The simple yet functional design of this cart lets you access any one of the four milk crates at any time simply by sliding the desired milk crate out and away from the cart. (With the exception of the top-most milk crate which is always accessible.) There are two built in stoppers on each of the bottom three slots which hold your milk crate in place, this prevents your milk crate from accidentally falling out. There is no sliding mechanism on any of the racks so you don't have to worry about small part breaking, this cart can handle a fully loaded milk crate.