I use the Tom Bihn Breve & one of there many bags. Right now the imago.
http://www.tombihn.com/page/001/PROD/300/TB0225
http://www.tombihn.com/page/001/PROD/200/TB0810
Next week I'll be on a cruise & taking a super ego. I need the extra space.
http://www.tombihn.com/page/001/PROD/200/TB0825