I used to have a pump when I rode with the lightweight thin tubes and was prone to flats every 10 rides or so like most other riders. Then I switched over to really thick puncture proof tubes and now I don't ride with either and don't worry about flats. On a group ride a few weeks ago someone said I was crazy to not ride with a pump, c02, spare tubes and a tire changing tool. I thought he was the crazy one because he had a small bag on his frame and one under his seat. I just don't see the logic in packing all that crap in bags and pockets when you can prepare to avoid flats to begin with. Like they say to each his own.