Hi Rob,
This is a favourite subject.
One of the big questions is where do you plan to go. From the UK, if you go West you get loads of baggage allowance and travelling with dive kit and cameras is easy. Pelican cases in the hold. From memory BA trans-Atlantic is 2 cases of each up to 32kg. If you go east - either long haul to the SE Asia or charter flight to the Red Sea you get no decent baggage allowance - often only a total of 20kg (less than 30% of flying the other way!). Not fair - and makes having a standard way of doing things impossible.
So over the years I have bought all my dive kit based on only one criterion - its weight in air. I don't care how well my fins/BC/regs work - just that they are light! Cut off the D rings, cut the lead out of safety sausages, buy an air X computer. Obsessed? Yes!
I use a aluminium box (aluminium is a rare metal we only have in the UK - you guys have a similar material in the States called aluminum) which weighs 15kg with my 2 Subals, 2 subtronics, dome, and two flat ports. My dive kit and other camera kit (synch cords, strobe arms, chargers etc) weights about 15kgs too - which go in a soft bag.
Last year to get my Hasselblad to the Red Sea I wore all my dry clothes for the week on the plane - 4 tshirts, shorts under trousers! Camera jackets with large pockets are very popular. Fellow BSoUP members often get these up to 15kg!
I then take my cameras in a square, soft camera bag that is very voluminous, without looking attention attractingly large (those check in girls have sharp eyes!). I take my laptop on in a plastic bag - they never check plastic bags! Music shop plastic bags (made for 12" records) are a perfect fit for a Titanium Powerbook!
Alex
p.s. if you are worried about you bags - the UK airports have delicate/oversized luggage "shoots" - get the check in girl to tag it and then she'll tell you where the other shoot is. (Then you fill it up with all the heavy stuff your mate is holding! Ha ha!
p.p.s. The other trick is too be charming/flirty or friendly - You look down, they know you're lying and up, they know you don't know the truth. Don't use seven words when four will do. Don't shift your weight, look always at your mark but don't stare, be specific but not memorable, be funny but don't make him laugh. He's got to like you then forget you the moment you've left his side. And for God's sake, whatever you do, don't, under any circumstances