sorry
I saw you asked that question and forgot to answer it. The tag says that the exterior fabric is water resistant, not water proof.
it may be easier to find a bag that you like then get a rain cover for it, basspro.com has one in blaze orange

http://www.basspro.com/webapp/wcs/stores/servlet/Product_10151_-1_10001_97299_400008012_400000000_400008000_400-8-12

Just an idea that might help