[QUOTE=MNBikeCommuter;13139973]Ohhhhh boy. You expect us to help reduce the confusion? You're so naive. :-)QUOTE]

+1 and counting...

What I have is a Delta Universal Mega Rack w/Axiom expandable mtn panniers. They're not wp, so I wped them myself. Triple coated them inside and out w/Thompson's Watersealer. Used a 3" oil brush. Paid particular attention to the seams and zippered areas. Also, I wrap anything I carry in either plastic grocery bags or kitchen trashbags because water is relentless and sneaky. Ortlieb Classic panniers are probably better, but cost alot. This was my 'redneck' option.

My routine consists of carrying a weeks worth of clothes into work on Mondays w/my 'full kit' multi-geared CX bike w/a trunkbag, panniers, etc. as described above. Then the rest of the week I ride a fixed-gear conversion w/a seatpost rack/trunkbag combo that can fit empty food containers and soiled work clothes. It's light, fast and low maintenance. Plus, it's a much better workout as my commute is 41.2 miles rt w/a 500 ft elevation climb on the homeward leg. The last 6 miles is 450 ft.

Also, I keep extra clothes and a full compliment of personal items such as toothpaste, toothbrush, deo, witch hazel, medicated talc(Gold Bond), towel, facecloth and a dozen or so Clif bars. My mantra for cycle-commuting is 'Never commute in one's work clothes or work in one's commuting clothes'.

Btw, I roll all my shirts and shorts(I do warehouse work) and then unroll them upon arrival and store them in a box. I'm able to change in a restroom w/a doorlock to avoid being compromised. Anyway, Nashbar and Performance both have a clothesbag type pannier that folds over a given rack. They're the same item w/different names and neither are waterproof. Sometimes, they're on sale for as little as 50.00US. And you can try the Thompson's 'redneck' method. It does work. As you're a teacher and may be required to wear suit jackets, etc. this may be a better option in terms of a clothing transport item.

All the best and thank you for your work in educating the next generation. It can be a thankless role at times. My sister's a math teacher in Philly...calculus to AT students in the inner city. My favorite movie is 'Stand And Deliver' because it reminds me of her.