This bag weights only 2 lbs 3 ounces, with most of the features you'd expect out of both a duffel and a travel backpack.
Eagle Creek added smart features for saving weight. For example, the backpack shoulder straps are unclipped and attached to eachother, which forms the single cross body strap.

Unlike many other lightweight convertible bags, the Go Duffel has both a sternum strap and hip belt for added comfort and support when worn as a backpack.