I’ve actually been using this pair of panniers for almost a year. I got caught in a downpour last night, which was fine since the bags are waterproof to their interior volumes. However, the zippers are not water resistant. The zippered pockets can get pretty damp in heavy rain. So I’ve never kept anything water sensitive in the pockets.
Last night after that torrent of rain, I discovered a hidden feature of the bags: each bag has a rain “poncho” to cover itself when needed.
These bags are the Bontrager Interchange Urban Commuter Panniers. They’re sold as a set of two, $179. (Bontrager has been one of Trek’s component & accessory divisions since 1995.) Each bag contains the volume of a paper grocery sack. http://store.trekbikes.com/product/bontrager+interchange+urban+commuter+pannier.do