Re: Change to J carry on, max 7kg per bag
I doubt you can really do a trip with a wheeled bag now with the 7kg limit. The lightest wheelie carry on bag I have in my collection is 1.65kg (an el cheapo I picked up in a John Little sale in Sg). I did 10 days in HK and Sg last year, but I only needed shorts, t-shirts etc. and I managed to wash a few things along the way, so came home with a couple of unused items! I flew SQ and they did weigh my bag at checkin in Melbourne. It was 7.1kg. But I also had a very small shoulder bag with my tablet, kindle etc. So I guess my total weight would have been closer to 10kgs all up.
Don't do biz trips so can't really comment, but I would say that you would be restricted to just a couple of days, ie wear one suit and take clean shirts, etc. I guess some people could also manage with a tablet for a day or two to replace laptops. Some execs also have the advantage of expenses, so can use hotel laundry to maintain supply of clean clothes over a longer period.
Whilst most of us are now addicted to wheelie bags - especially me as I have back problems, I think we have to consider just using a lightweight hand carry bag, if we want to maximise our 7kgs. I have a lightweight nylon Puma Sports bag weighing about 200 grams with shoulder strap. I am planning to try and do a week long trip to Malaysia next month with it, though it may be a little small. It is smaller than the standard QF carry on dimensions of 56x36x23, so I need to find something a little bigger maybe. I was looking at a Black Wolf bag, but the weight is up to about 500grams then.
I have also cheated a bit as I have also been gradually buying lightweight clothes, when I see useful things on special. I specifically use only when travelling, so that has helped enormously in keeping the weight right down. That and taking old clothes which I discard along the way!