I did not know this closing system, but it's really TOP! The package seems small but happens all the boxes are in the biggest. Finally interesting point for a daily storage. the plastic seems to me rather well because not brittle and relatively thick. The blue silicone gasket is handy to close tightly. And last little info, the largest integrated grid box in the background (probably for cheese) which of course is removable. Tres Bon purchase worth every penny.