Oxa Fashion via Amazon offers the Oxa 20-Liter Waterproof Dry Bag in Orange bundled with an Oxa Waterproof Phone Case and two Oxa Drawstring Bags for $19.99. Coupon code "YTU3LBMJ" cuts it to $13.99. Plus, Prime members bag free shipping. That's tied with our August mention, $19 off list, and the lowest price we could find. It features removable and adjustable shoulder straps.