1)Air is removed from the container by means of a sophisticated vacuum pump. 						 2)It's ecologic: No batteries or electricity necessary					 3)Especial bead design on the bottom, avoiding the box sliding on the table						 4)Push the buttle "push"let the air into the box, so you can open it easily						 5)They can put together, so save a lot of room. Also, it is very beautiful. 						 6)When the box has no air, marinating food become a very easy thing. You need lesss time to marinate food
7)Vacuum lock design, air press will let the lid and body locked.
Certificate: FDA of USA, SGS of Germany