We have owned and carried with us a version of this bag for more than 20 years! The Patagonia MLC 45L made with the "black hole" fabric is one of the very best travel bags on the planet.
The Patagonia Black Hole MLC 45L carries a spare set of clothes, my computer, my most prized fly reels, and all the critical travel documents required. Even when it's jam backed it comfortably fits in virtually any over head compartment. The super tough water resistant fabric material has proven itself over time.
Light and strong polyester ripstop with highly weatherproof TPU laminate
Main zippered compartment opens like a book and features two separate compartments for easy packing, access and organization
Second zippered compartment holds shoes
Two small zippered pockets organize essentials; third pocket with key clip provides easy access to tickets and passport; fourth pocket sits flat for documents and magazines
Three carrying options: backpack style with ergonomic shoulder straps that tuck neatly into a zippered compartment; shoulder-bag style with comfortable shoulder strap;
briefcase style with two carry handles
Rear sleeve allows you to slip the tote on and off rolling luggage handles