We do not recommend storing the magnets on the lunchbox.   If the lunchbox is not completely dry, the magnets may degrade and cause the lunchbox lid to rust underneath them.   Please remove the magnets when you clean the lunchbox.  The magnets can be stored on the refrigerator or another convenient spot.   Some customers keep their cardboard Rover, Launch or Shuttle packing box and store the magnets inside it or inside the carry bag pocket.