This is to all the comments about "why bring food back to the ship?" True -- there is a ton of food on the ship. But sometimes some of the local stuff is SO good. And for folks like me who crash into bed early, having something to snack on in my room is a good thing. I'm not apt to get dressed to go off to eat somewhere, or call for room service when I'm in my jammies!
On our last Alaska cruise we bought smoked salmon, creamed cheese, crackers, some other such treats, and kept them in our cabin fridge OK.