Patagonia makes a bag that serves the same purpose w/ many of the same features. I’ve had mine for 15 years (so, the concept isn’t new) and think it’s one of the greatest things ever invented (like you w/ your bag). It’s called the MLC (stands for Maximum Legal Carry-on). It too can be worn like a backpack, shoulder/messenger bag and carried like a suitcase. http://bit.ly/1QTQt46