[スーリー] リュック Crossover 2 Backpack 30L ノートパソコン収納可

It may be intentional in the design but do the walls of this bag feel warped slightly and/or that it has cardboard inside each wall/flap?

Is the forest night color more green or more brown? Every photo looks different

Will this fit under the seat of an aircraft or would I be better off with the 20L size?

Can the main and laptop compartments be locked with a padlock?