the way I get it, it is a hanging 'thing' about 9" by 30" long with pockets (you can actually see them on ebay) they hang from the silver 'fish' on the outside of your cabin door. Many people make their own and those who don't sew just use fabric glue. relatively easy. If you go to cruise meets and click on your cruise, there is usually some enterprising person that will 'organize' it. You get names, cabin #'s etc. and then during the cruise you put small trinkets/gifts into other people's extender. (kinda like Halloween) It seems like a fun thing to come to your room and find a treat in the'fish'. Maybe some post-it notes, maybe a post card, maybe bubbles for the sailaway party. At least this is what i think it is. Granted it takes some searching and perseverance to find out. At first I thought 'oh no - 2500 people', but only a dozen or so sign up to do it so it isn't a chore and the kids love bringing the stuff to the different cabins.