Porcelain and ceramic cereal-style bowls are described as stackable for easy storage. Plastic and glass mixing-bowl sets are advertised with a nesting design so the bowls fit inside one another for more compact storage.
Care guidance varies: many lids and containers are top-rack dishwasher-safe. Leak-proof silicone sealing rings are often removable and the guidance is to hand wash them and let them dry completely before reassembling. Product notes also commonly advise not to heat lids in the oven or microwave.