Big LL Bean BackPack: Reg, Mask, Dive Computers (2), Laptop, Shorts, 1 underwear/sox change, travel info files, chargers, power supplies, snack bars, toothpaste/brush, book
Camera Fanny: Camera, extra memory cards
Extra Fanny: batteries, meds, MP3 player, palm pilot, phone, earbuds.
Giant Rolling Duffle: Fins, BC, Wetsuits (2), spare mask, spare reg, booties, spare booties, sandals, snorkel, two shirts, two tee shirts, two nylon pants, 5 bathing suits, toiletries bag, miscellaneous.
Pelikan Case: Camera housing.
They can't take the fanny packs away, so, even though I look like super Dork (or one of the bandits in Treasure of the Sierra Madre) , I know I'll have my batteries and camera handy and they won't be adding to the weight of my checked or "carry on" baggage.
I do carry on the backpack and camera case. I've got a "Bihn Bag" for my laptop that's made to fit inside a backpack. If the pack won't fit in the overhead of a puddle jumper, I just remove the Bihn Bag and stash the computer under the seat. Then the pack will fit in any overhead I've seen.
Regards,