Originally Posted by
billyymc
I ride with a backpack often. Do my commute with a backpack filled with my clothes, lunch, and sometimes even a laptop. Have done up to 80 miles with a backpack.
I find the key is to get a pack that adjusts so that it just rests in the small of your back when you're riding - that way you don't even notice the weight.
I hadn't seen this when I responded earlier. As I mentioned, I do the same thing. Very comfortable and cool.