No locker for me, but I keep a big stash of clothes, food and other supplies in my office. I replenish on days that I drive and take home laundry. For clothes, I keep at least 2 pairs of pants, shoes, belt, and a bunch of t-shirts, dress shirts, polos, and underwear. Also towels, bath supplies. In my fridge, I keep yogurt, fruit, diet drinks, water, coffee creamer, cheese and my lunch for the day. On shelves and in drawers, I keep a stash of foods that don't need refrigeration - granola bars, nuts, canned soup, Wheat Thins, oatmeal, chocolate bars, etc.

I usually end up driving for one reason or another 1-2 days/week, so I often swing by Target on those days and pick up more food and drinks. I bring fresh clothes to work on those days and take home laundry. Also run other errands.

With this sort of system, I really don't need to carry that much gear on my bike each day -- mainly tools and tire changing gear, wallet, cell phone, water, underwear and lunch. All this easily fits in a large seat bag. I wouldn't enjoy commuting as much if I had to lug panniers filled with clothes and gear every day.