Passport case

next weekend im riding the L2P24, i would like to keep with me my Passport, credit card and a few euro's. these need to be kept dry, i dont use a large saddle bag (like to keep this to minimum) , too easy to fall out of rear jersey pocket when riding. any sensible ideas????
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I also remember seeing some on wiggle: http://www.wiggle.co.uk/dhb-jersey-bin-waterproof-pocket/
Depending on the weather - wear 2 jerseys - and put your valuables in the inner one ? I use the same thing for my iphone - never had a problem.