AC, NH, KE

Pretty much will be empty going overseas other than a laptop and other small things like electronics stuff (phone charger) and toiletries.

Since there is a lot more room in the overhead compartments since there are less people in J, changes of me being allowed to bring on an 85L backpack that's been compressed by its compression straps?

I know I can get complimentary check-in but that means I gotta carry a third smaller backpack as carryon for my laptop