While there's no strict size limit, NCL does recommend that carry-on bags be no larger than 22 inches tall, 14 inches wide, and 9 inches deep. That's a pretty good size, if you ask me! And, if you're wondering, personal items like purses, laptops, and cameras are all fair game, as long as they're not too bulky.
Now, here's a fun fact: did you know that NCL has a dedicated team that checks carry-on bags at the pier? They're like the bag police, making sure everyone is following the rules! And, if you're found to have a bag that's too big or too heavy, you might have to check it or leave it behind, so be careful.