NRS Cylinder Drycase gives good protection for repair kits, first aid kits or personal items. Water resistant, non-submersible. The rope lanyard attached to the lid gives you a convenient place to attach a carabineer or strap, securing your drycase to your boat. There's a rubber O-ring inside the screw-on lid that keeps out splash. The case is water resistant, but non-submersible.
