Spare Storage

Hi Adam, welcome to BT!

Saddlebag--you can buy them at bike stores (some sports stores). They strap on under your saddle and to the seatpost, and the smaller ones are completely shielded by the saddle (even the medium ones would be shielded by your butt, unless it's the tiniest in the world). So no aerodynamic problem.

Have fun riding!

My problem is that I can't find one with a strap long enough to go around an aero seat post.

Seriously? Wow. Is there a local bike store you can ask for advice or just get a long velcro strap to put on it (a lot of models have a lengthwise loop down the back that the seat strap goes through). I guess depending on your saddle position, you might not be able to just use the rails strap, although mine will stay on fine under the seat with just that strap if I tighten it enough.

In a nutshell:

http://www.bikesportmichigan.com/features/flatkit.shtml