by kevin_t » Wed Apr 23, 2014 6:52 am
You can have a bladder in the main bag and slip it out one side of the roll top as well, by not rolling one side super tight as well.
Correct the bags are not technically waterproof, but IMO, they are reasonably waterproof for most uses except submersion.
I've done testing in a variety of configurations and even in the shower and been pretty satisfied. Most water, outside of the zipper gets in through wicking not through the seams. Even in our tents, while we advise seam sealing, I rarely do it on my own except areas that may wick. The seams do pretty well.