I switched out every other mix matched container sets and bought multiple sets of these I love them that much.  I use the Medium sets for lunches and the Large sets for leftovers in the fridge.  I have two sets of each pantry container and everything is easy to look at with the contents easily identifiable. I put these in the dishwasher on the top shelf only because they tend to warp or degrade when on the bottom rack so watch that.  The locking feature makes all of my coworkers jealous since mine never spill out the sides or are ever at risk of the lid popping off.