One of the small number of survivors of the KAL B747 crash on approach to Guam was a Kiwi helicopter pilot. He attributes his survival to two things, 1. he was seated near the rear of the aeroplane and 2. at the time of the impact he was bent forward tying up his shoelaces, ie he effectively was in the "Brace" position and his head was below the height of the seat backs. Many of the pax seated around him perished as a result of severe head trauma when they were hit by sections of overhead bins which had broken from their mounts as a result of impact forces. He views overhead bins as lethal in a crash, so, does the increase in pax bag weight that Jetstar proposes mean that they will become more lethal in that they may break their mounts when lower forces are encountered? I agree with Capt Cynical in that pax will jam as much as possible in their cabin bags to avoid paying $10 for a checked bag.