FlyerTalk Evangelist
Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: BA Silver, TK E+, AA PP, Hyatt Globalist, Marriott LT Plat, Hilton Diamond
Posts: 13,047
My personal opinion is that if your carry-on is so heavy that you need help to get in into the overhead bin... then you're carrying on too much. And some airlines have strict policies about staff not helping passengers lift things...
But you shouldn't run into a problem in J with ground staff weighing your carry-on. You might have problems at TSA though, as I struggle to imagine a standard roll-aboard weighing that much unless it's full of books, metal bars or over-sized liquids...