Another vote for Pelicans but here is my history on that
I bought my first Pelican along with my used Motormarine IIex/YS60/20mm/Macro2T.
It was a 1550 w/foam, worked great, but when witching systems I always needed a new foam set, so I bought a divider set for it which I think are much better/versatile than foam.
Upon moving to a housed SLR the 1550 was getting smaller, as I have many ports, extensions and I like big domes, thought about it and got a 1610 w/dividers. There I keep all the hardware (housing, dome, ports, arms, cables, strobes, solding iron, batteries+charger, even my wifes Coolpix housing...). The 1610 is well above carry-on limit, but I lock it and dispatch it, never had a problem.
Sensitive gear like cameras, lenses I carry on a LowePro Mini-Trekker (but I recommend the Mini-Trekker AW), it is below carry-on limit, nice to haul equipment for land photos and If I need it fits just right inside the 1550 (once I had to carry the mounted housing on top of the 1550 - w/ the lowepro inside - folating for some 50m outside a 1-2ft swell to a zodiac for a dive!!!).
This is the inside of the beast... there are more compact macro ports, base and extensions under the one shown near the dome.
Now I have the following:
- Pel1610 for hard stuff (dispatchable);
- LowePro Mini-Trekker for eletronics (carry-on);
- Pel1550 for film housing; Nikonos w/ Aqualens, macro, arms and strobes; or LowePro.
A few years ago, I used to develop my own slides on the road at night, using the 1550 as a tank for the warm water. Use to kid my friends saying that wherever one can make tea I could develop my slides!
For the new user, I recommend to start with the 1510 (which is bigger than the
1550!!!) or the 1560, but if you plan to buy a big 8pol dome and stick w/ a system for some time accumulating some accesories, go for the 1610. putting the dome standing up is a BIG space saver. For your cameras/lenses, in case of a DSLR YOU MUST BUY ONE PADDED BACKPACK, the U$100 was paid in a week of buying it when a taxi driver droped it from chest-height, with all my lenses and camera inside. In digital era maybe a Compu-Trekker AW would be my choice now, though I plan to buy one Pelican Notebook case to take the note to live-aboards.