I have the boxes only recently, but since I cook every day and my husband can always recognize a portion for the next day, the boxes are also accordingly often in use. They settled well and easy seal. Unfortunately, the cover have now somewhat deformed by about 5 Dishwasher passages, making the closure more difficult. Even though it goes. Sealing the boxes are definitely stay and smells even where they should be. However, since they not as advertised "dishwasher safe" are, there is a star deduction.