Weight played a factor, so I narrowed it down to my 1DX, 600mm f4 + tripod, 35mm f1.4, 14mm 2.8, 70-200mm 1.4/2x extenders and bringing a charger and extra battery. I hope it all fits. I tried to wrap my 600 in bubblewrap this morning and it no longer fit in my bag. One way or another I am getting it there! Wish me luck, I leave tomorrow morning!