Yeah had a few occasions even out of having a bag of frozen veggies in a grocery sack - and the condensation leached over to mah papers. Not good.

While I double bag all the lunch time preps - I have seen some slim waterproof type zip up kinda cool small portfolios. Go to a Staples, etc for one. If you're carrying papers - it's a great thing, if you have to have original signature I mean - otherwise it's on the shared drive or e-mailed.