Paul and Expat, I thank you for your concerns about the weight. But, I've been working out the past few weeks
and the effort is starting to pay off.
I guess most would think I'm overdoing it with all I'm taking, but this is a very typical set-up for me. As I said, it probably weighs no more than 35 pounds, and it 's not unusual for me to take this much on a hike for several hours, or cycling thirty, forty, fifty or more miles.
I'd love to pare this down some more, but I certainly can't see doing without both a 1DX and a 1DS. I've come not to trust anything else. And, I still feel the need of a third as back-up, though I MIGHT concede a 7D over a second 1DS. I'm very happy with my lens choices, and it will take a stronger man than I to pry that 300 from me. If I could squeeze in one more piece of glass, the suggestion of something fast sounds most appealing.
Surprisingly, all this concern about weight and many of you recommend a tripod. I take one, too, except I just don't know where I'd carry it. I can live without a flash, and, if I take the 7D, I'd have one built in, which would work in a pinch. It seems not many care for my taking a monopod, but I've captured many a shot with my 300 at shutter speeds of 1/60 and even 1/30. The table tripod appears to be a no-brainer, as it takes up little space and weighs even less.
I often flown with this pack and it's seldom been a big deal. All-up my kit AND me check in at 220 pounds, an even 100 kg. Far more a problem on these flights for me (at 6'3) is insufficient legroom.