For stuff that absolutely must stay dry, Mad Dog Gear offers its Waterproof Short Duffel. The 2,600-cubic-inch bag is made of reinforced PVC and features an 8-inch ABS plastic screw lid with neoprene gasket for a totally waterproof seal. You can even fill the bag with air via a valve to make it float. Ideal for the boat, the blind, or the back of the pickup when it’s raining. About $45; call (800) 697-5801.