My experience with recent trips around SE Asia and the pacific from Australia has been the crack down on weight for carry-on baggage with all airlines flying out of Australia with 7kg of carry-on. I have my carry on weight on several occasions and what I do with my carry on on a few trips is to put my housing and parts in a cooler bag up to the 7kg limit wrapped in bubble wrap. But these days the budget airlines do offer excellent additional checkin baggage at a small cost. Jetstar allowing up to 40kg, Virgin Australia 2 bags at 23kg, Airasia 40kg, Cebu pacific allowing an extra bag for dive gear up to 40kg (just for dive gear). I have to base my flights around the airlines which give me the best allowance for camera and dive gear and most often its the budget carriers these days.