I made this bag for a trip to China. It was my only luggage for a two weeks trip. The zippered lid is removable, and I ended up keeping things I needed on hand like my passport, Kindle, notebook, etc. The rest of the bag went into the overhead bin. I ended up overstuffing it a bit on my return flight, but it still fit in the overhead bin with no issue.
Rolltop bag with G-hook buckle
12x6x22" when moderately full (can extend a bit taller)
Grey Cordura fabric (I believe it's 600 denier)
Removable zippered lid with plastic buckles
One large, open pocket in the front
Two medium zippered pockets in the front
Water bottle pockets with drawstring on both sides, with deeper pockets behind
Built-in pocket for laptop (outer layer is padded; layer between computer and inside of bag is not)