Simple Weatherproofing of IPhone

I was cooking this morning using my iPhone as a recipe book and I was thinking about how to keep my phone from getting wet and messy. It dawned on me the solution was so simple..

One ziptop sandwich bag.
One iPhone

Simply put the phone in the bag and use. Practical, and very effective.

Pros:
Cheap
Bags are plentiful
Instantly applicable to your phone when needed.
Leaves phone fully functional
Good protection from water and mess

Cons:
Not particularly attractive
Some softening of focus of the camera, while in the bag