Empilable Caps The Stackable Caps collection will be the perfect companion for all your cooking and plating needs. It comprises a wide range of salad bowls with lids as well as dishes of different capacities. Thanks to the lid, you can cook, serve and store all in one! The Stackable Caps collection is made of shock and chip resistant tempered glass and is lightweight and stackable. It is also dishwasher and microwave safe.