REI Duck's Back Rain Cover - 40 Liters - $22.50

With a waterproof polyurethane coating to keep out the rain, the REI Duck's Back 40 backpack cover lets the elements roll off your pack even if you're not a duck. Drawstring shockcord with toggle lock securely cinches around pack for a snug fit. Zippered storage pouch doubles as an accessory pocket to stash small essentials; offers a vertical strap for easy securing or belt clip for quick horizontal attachment. Cover has bottom drain hole for release of trapped moisture. Pouch dimensions: 5.5 x 3.5 x 2 in. - $22.50