I bought the Ozark Trail Multi-Purpose Room for when we go camping. We use it to rinse off the sand from the lake or beach. It comes with it's own carrying case. It does not have the water bag (you have to purchase seperately) We use the water bag sometimes other times we use a water nozzel that you can hang up inside. It takes less than 5 minutes to assemble and disessemble the room. There are little pockets that are inside where you can place your soap, shampoo and conditioner. There are even tie downs that you can use if it is windy.
It is however difficult to remove sand and shells from the bottom after you rinse off. Make sure that you zip the room up when not in use. We made the mistake of not zipping it up and we had leaves that had blown into the room. Wet leaves are very difficult to remove.