Home / Education / Don't seal a wet lunch boxEducation lunch-boxes don seal wetDon't seal a wet lunch boxThe way to keep mold out of a lunch box is to make sure it’s bone dry before you snap it shut.Mold needs moisture and something to eat, and corners Search Amazon As an Amazon Associate, Work Notes may earn.Related NotesExploreExploreExplorePrevious Don't shock your pool with chlorine tablets.Next Don't run your salt chlorine generator below 60°F.