Clumsy or careful, the Waterseals automatic magnetic closure bag from Lewis N. Clark will protect your phone or valuables.  IP-X8 standard-waterproof to 100+ feet and dust-proof to a hermetic level.  Basically waterproof and airtight if you don't know what hermetic means (we had to look it up).  If you love to boat or canoe, this is a perfect way to keep your phone, money, keys, etc. dry if things literally go south.  A handy lanyard is included so you can tie it around something safe -- preferably not your neck. (fits phones up to 6.5 inches and available in blue or yellow)