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size

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > size

A standardized size of a product or creative work, often simplifying richer information into a simple textual string, either through referring to named sizes or (in the case of product markup), by adopting conventional simplifications. Use of QuantitativeValue with a unitCode or unitText can add more structure; in other cases, the /width, /height, /depth and /weight properties may be more applicable.
Values expected to be one of these types
DefinedTerm
QuantitativeValue
Text
Used on these types
CreativeWork
Product

Source

https://github.com/schemaorg/schemaorg/issues/1797