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Many cruise lines have limited outlets in the room, and you likely have at least one electronic item (i.e. cellphone) per person. I recommend charging your portable battery while exploring the ship, and when you return to the room, your outlet is free as you can use the fully charged battery pack to charge your phone(s).
I personally use this one from Anker and love it. - https://amzn.to/4128pZg
I've never used this one, but I saw the glowing paw print and had to include it :) - https://amzn.to/3HrT9y4
Got a papercut from your boarding pass? You'll be glad you had a first aid kit on hand. You can either purchase one, or make one yourself. I'd plan on bandages, gloves, ibuprofen and/or acetaminophen, tweezers, and Neosporin at a minimum.
I found this one, and it's on my list because of the included case (and they've graciously sponsored this link.) - https://amzn.to/4mfPyT8
Another solid option - https://amzn.to/4fszbzL
I've finally come to terms with packing cubes. As a guy, I tend to be a 'wing it' person and shove some random stuff in my suitcase and hope for the best. Buuuuut, packing cubes make packing easier, and double as dirty-laundry storage as the cruise goes on.
These come in a ton of fun colors - https://amzn.to/3Un7pen
I don't understand how these work, but they allegedly compress and get flat-ish... Reviews are good, I might have to try them... - https://amzn.to/40XBm8B