The Headway MLC (Maximum Legal Carry-on) from Patagonia is a very functional gear bag that works better as a duffel due to it’s uncomfortable (but hideable!) backpack straps.
Other Bags to Check Out:
A very well designed, stylish travel bag for one-bag travel with enough pockets, organization and access to make travel smooth.
The Monolith Weekender from Heimplanet is one of my favorites because it is very durable and simple. Carries all your shit, and comfortably!
The Topo Travel bag has a playful style, which I like a lot, but it is very serious about being a great travel bag. This is a classic.
The GR2 from GoRuck will last your entire life, features a segmented main compartment, is extensible with pouches and accessories and boasts a very rugged, handsome look.
Is this just, like the most quality built affordable carry-on travel backpack? It just might be.