I've got a question on something which hasn't been brought up on this thread yet.... on SFO to AUS I'm going to be hauling a folded up Persian rug that measures 56" (33,15,8) but was planning to put it in my hockey bag which measures 78" (42,18,18) if completely extended. Since there is a lot of loose space in the bag, would I need to cinch it with some sort of strap or would the agent generally be ok without designating it oversize because of the looseness of the bag that's easily collapsible?