Each PlanetBox lunch box comes with an easy to use and adjust latch.    The latch should keep the lid firmly closed.  These spare latches are available if the latch becomes misplaced or hard to adjust.

Latches are different sizes depending upon the style/size of lunchbox.   Rover has 5 compartments.  Launch has 3 compartments.  Shuttle has 2 compartments.   Please see graphic above to determine if your lunchbox is polished or brushed.