The main reason is that the newRecycle Lunch Box Machine has better heat resistance. Compared with the traditional lunch box, it is easy to melt or chemically react when it encounters hot blanching, which is not good for people's health. Most of the new environmentally-friendly lunch boxes can hold soup products without deformation or side leakage. The tightness is better. http://www.reexong.com/food-container-making-machine/recycle-lunch-box-machine.html