There is nothing more worrying than being caught in the rain with a bag that isn't completely waterproof. Totally waterproofing bags is expensive, and not a lot of bag manufacturers offer these types of bags. Tumi has just come out with their Hydro line, which proposes a series of completely waterproof bags.
The Tumi T-Tech is a waterproof messenger-style bag with enough places and pockets to fit all of your accessories. You'll enjoy the piece of mind that comes with having a waterproof bag. There is nothing like it. Water will just bead off, without being absorbed. The Tumi T-Tech comes in either orange, black or silver.