Bought the cruise kit, used the 3 large bags. Filled with clear vodka and rum. Don't over fill bags, just about 3/4, so you can roll them up. Place each in an extra large zip bag, toss in as many tubes of cosmetics, toothpaste, etc so you can to camouflage. Will not be detected. Also you are allowed a 12 pack of pop per person plus a bottle of wine (750 ml).
If your too chicken to do the rum runners, you can also pre order booze to your room, as much as you want, just call guest services, and that's way cheaper than paying by the glass. But you will still need some sort of flask so as to transfer the booze from the bottle. That's where a mini cooler comes in handy. You are allowed a small 12" inch type, this way you can pour from your flasks to your soda, etc.
The biggest issue will be whether or not your luggage survives the "handling" by the cruise staff. I was shocked to see how they toss the luggage around, so I wouldn't recommend any fancy luggage for a cruise nor packing any "treasured" items.