My bag is a Gura Gear Kiboko (the original model). It's a big bag about 2kg that just fits in the overhead bins of a Canadair Regional Jet 200.
In the bag I have:
Sony Alpha 99, a 24 MP full frame DSLR, this one is my main camera
Sony Alpha 77, a 24 MP APS-C camera that I use as a walkaround camera with a 16-80/3.5-4.5 zoom. This is also my "telephoto camera".
Sony Alpha 900, 24 MP full frame is sometimes carried as second full frame body. Convenient when using two lenses.
SAL 24-70/2.8ZA, this is my main lens.
SAL 70-400/4-5.6G, this is my other main lens.
Sigma 12-24/4.5-5.6 is an ultra wide angle not really good, but ultra wide.
Samyang 14/2.8 is a simple but well designed ultra wide angle lens. Much better than the Sigma.
Minolta 100/2.8 Macro I carry sometimes but seldom use.
Minolta 1.4XAPO tele extender.
Minolta 2XAPO tele extender (only used for motion)
Arca Swiss 4D gear head. Best stuff I ever had. Travels inside the bag. Mounted on tripod with RRS DVTL plate.
RRS Versas 3S tripod strapped to back.
Color Checker Passport
The above is the basic kit. I remove stuff to save weight or add other stuff on occasion.
Carl Zeiss Jena Flektogon 50/4 with ARAX shift adapter
Hasselblad Sonnar 150/4 with ARAX shift adapter
Flash, I almost never use flash except for shooting at home, but I have a flash I sometimes carry
So this is my pack. what is yours?