Thanks everyone for the advice and/or comments.
Since I didn't need a 100% waterproof bag, after spending a few days thinking about it, and I'm planning on using it for more than just waterfowl I went with the Sitka Full Choke bag. It's pricey but has a ton of great reviews and comments, and www.blackovis.com
had it for 20% off.
I will, however, look at a good dry bag (thanks Sniper John) and will probably put anything that MUST stay dry in there.