Dahon Tournado, Brompton M6L, Litespeed Ghisallo, CDale Tandem & more
I toured with some friends for a week, all on Bromptons. As much as I like my T-bag, one friend just used the cordura basket and stuck the 25L backpack he already had in it. We'd get to town, he'd take the pack off, flatten the basket and attach to his pack, and throw the whole thing on his back. Seemed to work really well.