Abstract: An ergonomically designed bag is configured with a strap system that is easily converted from a two-strap backpack mode into a single-strap shoulder bag mode. The carrying strap is attached at a first end to the top of the bag. The strap is longitudinally dividable with a zipper incorporated into the strap. When in the backpack mode the zipper is open to define a pair of straps, the lower ends of which are connected to D-rings on lateral sides of the front panel. When in the shoulder bag mode the zipper is closed and the lower ends of both straps are connected to a D-ring on a side panel of the bag.