Have a 32L Rimowa Topas. Hardly use it as the bag itself weighs just over 4kg and keep seeing carry on limits of 7kg (especially with Qantas and other Australian airlines but elsewhere in the world too) and don't want to pack everything in my carry on only to be forced to check it in.

Any tips from other Topas carry on owners re: this?

Did a search on this forum, and the internet more broadly, and don't really see anyone else with the problem - so maybe I'm just being paranoid.