I have a standard rubber surround on my iPhone for everyday use. I also have an Aquapac that I put it in when I fish... except the time I didn't and killed my first iPhone when I did an unintended spawning survey. Strap goes around the neck and you can still take/make calls and hear everything fine through the case. Highly recommended.

http://www.nrsweb.com/shop/product_list.asp?deptid=1631

Good luck,
AP