This Japanese site has the best pictures I've seen of them if you want to compare.

http://www.selectit.jp/item_acce/xpa...eb-flight.html

I'll definitely report back on the waterproofness. Something else to keep in mind is that the TiZip zippers take some force to open. Apparently they need lube frequently, which is included with the bag. I was worried about this at first, but then I realized that Ortlieb uses them on a lot of their products. I couldn't find any major complaints about the zippers online.