Other than a jacket, it's cheap, simple and easy. I personally have a goretex jacket I had from my military days which I use - in summer, unless it's particularly terrible and I'm prepared, I usually just get wet - but once it cools down, I'd want that jacket on for sure.

Any backpack/pannier can be waterproofed by using grocery bags to line and/or pack the contents in. Heck, the amount of bags I have collected at home I could double wrap everything to be super sure.

I was to go on a bikepool thing this morning, but another participant couldn't make it, so I ended up riding alone - was fun, lots of bikes to pass/say Hi to. Critical Mass tonight which I might just roll with for a bit, it's always entertaining from my past 2 experiences.

Now at 1280miles (not all commuting, I would hazard 800-850 as being commuter miles.) pretty proud of that.