Uses for Costco Black Plastic Food Trays?For several years we've been Costco members. We mostly purchase food items from them, especially prepared meals sealed in vacuum bags and also packaged in sturdy black plastic trays that have no lids. I've been using the trays as desk drawer office supply holders (the trays are the right size for pens, paper clips, little note pads, etc.), but I now have accumulated way more than I need.