When weight is a concern, try not using the carry on bags with wheels. Those bags themselves weigh about 6-7 lbs and the telescopic handle takes up space inside the bag. I use the Amazon basics carryon or the more expensive Patagonia MLC 45L both of which which weigh less than 2.2 lbs and are a breeze to carry on. It's amazing how much space and time (it's much faster to walk with these carry on's) you save when you use these. Oh and these provide O(1) access as they fold like a suitcase and not like a hiking bag which in my view has a best case o(n) access and worst case o(n^n) access.