Originally Posted by
wahoonc
F.... I believe there are a couple of companies that make a convertible bag that can be used as a pannier or a backpack, possibly Ortlieb.
Aaron
Ortlieb, Arkel, Delta Cycle, and Nashbar all offer(ed) a variant and word has it that Banjo Brothers showed off their "coming soon to a LBS near you!" design at Interbike.