Excellent - but that can be a challenge when you fly Euro airlines (like LH) where they weigh everything.
I have been doing carry-ons for 20+ years on my quarterly trips to either Vienna or Karlsruhe. Can manage 10 days worth of cloths, including 2 suits in a carry-on. I keep telling my DW, just remember, the ship does have laundry.
@Keith1010 Is Crystal partnering with a company? I know Regent is doing Luggage Forward and it makes it more secure knowing the cruise line is working with the company to make sure your bags are picked up and get home.