Yes, in the Spring and Fall, I'll take a messenger bag in with a few day's fresh changes of underwear and socks a some outer clothing, which gets me through about a week. That lets me travel light on the other days, which is important to me because I make a ride of it going home, and don't want to be loaded.

But in the late Spring and summer, it's too hot to bother with the messenger bag, so for $6.00 I'll let the mailman work for me once in a while. With a bit of planning, I'm riding light (nothing but me, the bike, and a few things in my pockets) most of the time, and only schlepping once a week or so. I also made a superlight, combo musette/messenger bag, that I keep packed, and it allows me to make a small grocery run on my way home.

I also work at home, but instead of lugging my laptop I only carry a USB drive.

When I read how much some people carry back and forth daily, I'm staggered that they are willing to keep it up day in, day out for years.