Kind of hard to innovate/put a ToJ twist on a weekender though. IMO it would have to do more than just offer a better price point than say, Guidi.
Two words: goatskin. More seriously - could do an older style military duffle that opens at the top. Most I have seen use crappy cheap canvas (recycled or otherwise) and are too big. Something weekend/carry-on size out of leather (or mixed materials) with a shoulder strap would also work and be unique and in the spirit of JC/ToJ. If all leather in brown I'm in.