This is the medium sized bag offered by Mission Workshop and retails for 250 bones.
Fits A LOT of stuff in it, as the sides unzip with an inner compartment that expands. In fact, you can fit more stuff in there than you OUGHT to carry. Stuff stays dry on even the most torrentially downpouringly of days. So, that's a plus.
HOWEVER, I'm feeling annoyed about something right now. Just now, as I was zipping it up, the last of the four zippers on this bag just broke. Yup, I've pulled all four of them right off the bag with just everyday use. I've had the bag about a year and a half. Right now, the bag, even though shows no wear at all, has been rendered useless. I'm pissed.
Manufacturers: If you are going to make a product that boasts water-proofness and roominess and charge us bozos 250 fucking dollars for it, please keep this in mind... I would be willing to pay $255 for better zippers.