Hmm, looks like the seapost from my Carryme is a perfect fit (and lighter too).

I always found the Carryme seat more comfortable anyway, plus I didn't need all that extra length on the stock post, so I think I'm going to just move the Carryme seat and post over to the Downtube and take this as an opportunity to upgrade the seatpost and seat on my Carryme to something lighter.

Does anyone have any recommendations on lightweight seatposts without getting ripped off? I'm thinking maybe a carbon seatpost with a Tioga Spider saddle. Now I just have to go practice saying "I'm sorry honey, but I had to buy a new seat and post because my old one was stolen!"