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scubatoys:I always just toss my reg in a reg bag, put my bc in the big dive bag, then put the reg bag in the middle of the BC and velcro the cummerbund over it. Then I stuff in my wet suit and other stuff around it. Have logged hundreds of thousands of miles this way and never have had a problem. Especially with today's security - carrying on a reg / computer will be a pain in the butt.
lairdb:I'm with Larry, and it hasn't bitten me yet. Regs and (small) camera housing in the center; wing around that, wetsuit pieces around that. The bag's hard bottom on the bottom, jetfins on each side, and backplate on top.