I'm taking a course on Conceptual Engineering this semester.  Your description of concepts as bundles perfectly describes my understanding of the reference/denotation distinction with respect to a context of utterance. It also accounts for my frustration with Cappelen's description of "assessing and improving" concepts, while refusing to give a non-vague description of concept. Like - which concept? (theres many subconcepts). And in what context?

All of which is a very circuitous way of saying, thank you!