The trays have a plus sign on one end and a minus sign on the other. To stack them, you have to stack the side with the plus sign over the tray below with a minus sign (or vice versa). If you have both trays with the same sign facing the same way, the top tray falls into the bottom tray. Good luck training your family, or coworkers, to pay attention to tray stacking direction. Buy ice trays that don't require training and thinking.
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