Submersible to a depth of 150-feet and fully waterproof as well as airtight, SubTech calls their Pro 3.0 Series, “the world’s most extreme dry bag.” They float, are built of ballistic materials, & there is an optional shockproof inflation system for safety & a “safety button” on the zipper to ensure closure & protection for your gear. Choose from 55L or 100L size. A funded Indiegogo.