QA has beancounters specifically assigned to calculate how much they rape and fleece their customers who are stupid enough to show up at the airport without weighing their bags.
The agents are specifically trained to extort as much money from you if you are overweight. I have personally seen agents want to charge people for being 2 kilos over.
Take a acceptable size carry on and stuff that as you like. Never seen any carrier weigh that but keep it out of sight as best as possible.
QA allowances are at best skimpy. Apply for the Priviledge Club and you will get more. What erks me the most about QA is the EXTORTIONATE fees they charge for every kilo over. ANd they are extortionate. There should be a law against it.
I personally took another airline this summer to avoid QA agents at Heathrow. Get this - every kilo overweight they demand 22 BRITISH POUNDS, YES POUNDS FOR EVERY F&*^ING KILO! Tell Al Baker to pay that then I will.
Im sorry but fees like that are just scamming and taking advantage of people. "YOUR 5 STAR AIRLINE" MY ARSE and "OVERWEIGHT BY A KILO? POOR POOR CHAP. BEND OVER AND WE WILL DO OUR BEST NOT TO HURT YOUR BUM" THEIVES.