Does it fit under an airplane seat?

Yes. At 16 inches it is sized as a personal item and owners report it sliding under the seat on most major airlines. Check your carrier's personal-item limits, since a few are stricter.

Is 6.2 lb too heavy for a carry-on?

It is heavy for a bag this size. The eight-wheel frame adds weight, so it is better rolled than carried. If you often lift your bag into an overhead bin, a lighter two-wheel bag may suit you better.

How does it compare with the two-wheel London Fog spinners?

The Cambridge rolls upright on eight wheels, which is easier in tight aisles, but it weighs more and has more moving parts. Two-wheel models are lighter and simpler but need tilting to move.

How much can it hold?

It is a personal-item bag, so expect enough for one to two nights or as a second bag alongside a carry-on. It is not a substitute for a full-size carry-on.

What is included with the bag?

It ships as a single bag. No packing cubes or accessories are included.

Is the white exterior hard to keep clean?

Yes. The solid white fabric shows dirt and scuffs, and spot cleaning is needed after rough trips. A darker colorway is easier to maintain if that matters to you.