POCKET TUBE / leisure time

People carry many items to go on a waterside.
Even they wear swimsuit and carry a tube when go into the water,
their important belongings will be kept out of the water.
Therefore, they feel anxious for the belongings to be stolen.
To use them while dabbling in the water, they should go out.
Make a storage space using zipper bag in a tube
to keep and use the belongings in the water.