We received the sling bag earlier this month on our fourth cruise, it WAS nice to have. After we got home I found out dh had taken it out of his suitcase when he was packing to go home and forgot to put it back in. Good thing we already have another cruise booked, so we'll get another one. Otherwise I might have used that as an excuse just to book another cruise, lol!!
Wanted to add if anyone is going on a cruise and planning on visiting any beaches, you'll want to bring along another bag to use, especially if you have more than 2 people. The sling bag is a lot smaller than the beach bag, you'll be able to get about 2 towels in it. We used our beach bag to put towels, change of clothes in and used the slingback for sunscreen, sunglasses, water bottles, etc. Works good for a lot of small items.