I'm very interested in a breakaway myself...the excel website says that the s&s case works well with the breakaway: http://www.excelsports.com/new.asp?p...ajor=9&minor=1
but I don't have any experience myself...if looks like a tight fit and it might be that certain things could be packed separately, but I can't image anything but the saddle and seatpost being packed spearately.