If you are touring with an iPad definitely leavy the heavy otterbox type case behind and get something like one of these types of waterproof cases
http://www.rei.com/product/850902/e-...ries-case-ipad
There are a variety of companies that make them. Basically just fancy zip-lock bags to keep the moisture out. You can still use the iPad through the plastic. Getting the same thing for the phone is a good idea too. In fact you could probably get by with a regular zip lock bag in the gallon or larger size.