Packed up for a tour in Ontario, spring 2012. Excellent riding with some well-selected gear. The Wolfman panniers didn't leak a drop, and held tight to the bike in heavy rain. No complaints at all.
There are some that may criticize the Wolfman gear for not being slash-proof or whatever. You can go with that, if you wish. In my experience as a raft guide, these style bags just flat-out work. The PVC material is amazingly durable and abrasion resistant. They weigh nothing. They are dry, and hold all your gear in moderately secure storage. I've not been disappointed yet by the Wolfman.
If you can't fit it in, you're packing too much.
More of that:
These ran the TAT: