Abstract: A safe, dry storage compartment for use in combination with a jet ski water craft, the compartment being adapted for secure affixure to the top surface of a jet ski guide arm. The compartment consists of a mounting structure that is adapted for secure affixure to the guide arm and which is further formed to include a storage container of elongate volume. A hinged container cover is then secured over the elongate container opening and locked closed in sealed relationship to protect personal valuables, dry matter and the like stored within the compartment container.