Ways to keep Iphone safe from rain?

Ok, so this Saturday(6/14/14) is warped tour(an outdoor concert/festival) and there's a chance of rain. I have an Iphone 4s and no life proof case. I do, however, have an Otter box defender case, but i'm not exactly sure how it will work against rain. Is there any cheep way I can protect my phone?

Plastic baggie with the seal on top?

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