I just got a Cervelo P2C (and love it!) but the saddle bag I got for it doesn't seem to fit. I've got the saddle in the steep forward position so there isn't a lot of saddle rail available and the velcro closure for the seat post can't make it around the elongated aero seat post.

For those of you with bikes with aero seat posts: what have you used and what works? I need something to keep a spare tube and CO2 canister in.

Thanks in advance.

For short races either skip the spare or tape them to your seat post with electrical tape. For a longer race, cut the top off a water bottle, stuff them in and place that in one of your behind-the-seat water bottle cages. HTH

Try a Bento Box. They go on top of the top tube behind the stem.

Another option is a bottle rack behind the seat, their are several available that allow you to mount a tube and CO2.