Are your blocks 8-1/2" unfinished?
If so ... they would slide into the pocket envelopes that are meant to hold a piece of paper in a binder. There are some that are a little wider that the 8-1/2" that will hold several pages, so would make it easier to slide a block into it.
These would let you put them in your suitcase, taking minimal space. Plus would protect your blocks well.