There are those among us who tend to go through cell-phones and other small electronics like candy. Most anything not tied to the boat is at risk of being dropped overboard—keys, tools, handheld VHFs and GPSs—and more likely to die by

The Underwater Kinetics UltraBox 408 we tested came with a detachable mesh pouch for storing loose items, molded-rubber padding that keeps contents from rattling or breaking, and an adjustable lanyard.

drowning than old age. For us, keeping a drybox onboard or in the dinghy is well worth the investment. It’s useful for storing important paperwork, other valuables, and electronics.

There are several different brands of dryboxes on the market. We checked out the UK UltraBox 408, a submersible (to 30 feet), crushproof box that comes in a range of sizes and is made by Underwater Kinetics (the maker of…