I teach art on weekends. This trolley is AMAZING for hauling all the supplies needed for the students!  Best part Since it comes apart, all of the sections fit in the trunk of the car! I can use how many sections I want, and cleanly store supplies at home in this thing. ) The locking mechanisms do push the plastic sidewalls in a little. Translation *if* the trolley is HEAVY  full- Do Not lift the top handle thinking it will help coax it up some stairs. The side locks can shift and come undone. Granted-most people are using this for makeup, not an art cart. Love them so much-got 1 for art,  1 for bead storage! Deep storage  removable casters are awesome!