The cavity volume should have been little more. If you are traveling alone for 5-7 days, it will suffice the need. For two person, go for bigger size. The bigger size will fit well under AC 3 tier railway seat.
It impresses with its sturdy build, which adds durability to its design. However, there's room for improvement in the quality of the zipper chain. While it functions adequately, a smoother and more robust zipper chain would elevate the overall experience of using this bag.