I've had a lot of business in Indianapolis this week and have driven up there nearly every day.

I'm surprised to see several riders, on busy roads, riding with big back packs on.

I'm one who doesn't even put a powerbar in my jersey pockets because it's uncomfortable (maybe due to the "love handles" under the jersey ), so I have a couple of questions:
  • is it advisable to ride with a big pack?
  • are they commuters with their clothes in the pack?
  • are any of you comfortable with big packs on your back?