I don't have one now but I had a couple in the past. The straps were pretty short to begin with. I can't imagine doubling them. Here is a picture of the original. The strap is so much shorter than this version.Actually I have several original NYC Duffles, with the original strap, and I double the strap all the time to wear more like a hobo. Takes a bit of pushing, but it works. So i can't imagine the newer remake wont work, since the strap has to be thinner than the original thick NYC straps!!! now i'm curious though.

I have the shoulder sac which is a slimmer version of the duffle sac. It has a much longer strap than the duffle sac. It is very difficult to double the strap but when I tried it, it is almost too short.