I've never weighed it and am afraid to. I wouldn't carry everything myself and my wife balks at carrying the little (I say!) that I won't. Where the going isn't too rough my Ruxxac cart is very useful. Where it is too rough for the Ruxxac I walk in, decide what I'll use, walk back out, and walk in with no more, sometimes less, that what's needed. My wife says that walking is good for me.
The most I've ever flown with was: Pelican 1500 with 2 Nikons, 2 283s, 5 lenses; Tundra Sea King 821 with Beaulieu 4008ZM2 and 5008S-MS, their zooms, 4 prime lenses, filters, ...; 30v battery belt (home brew, 15 2v lead acid cells) with spare cells to make charging easier; tripods; Omni Light; 40 rolls of S8 film, much 35 mm still.
I carried all but the tripods and the Omni on board. This on a trip to Paraguay in 1992. Those were the days! I can't imagine being allowed to take the battery belt near a plane nowadays.