This ThinkTank Streetwalker Pro (closely enough) meets United’s “personal item” size requirements, and will hold a 645z, 3 lenses (plus a long lens—400 in this pic—on the camera), and a flash:
(An NII is posing as not-yet-arrived 645z.)
The other lenses will be wrapped in clothes and put in my rolling bag along with essentials. Remaining clothes and tripod will go in a checked bag.
The tripod is a Gitzo Mountaineer 3532, which packs compactly in a checked bag. The Arca Monoball is heavy but stable and compact. I remove the head and pack it separately, if necessary. You can also use it as a gimbal head.
It’s expensive, but has the highest stability/weight ratio I’ve ever experienced. I replaced the feet with those that have spikes exposed by screwing in the rubber feet.
For long lenses, stick with a high shutter speed and adjust ISO as needed. That’s one of the great advantages of the 645z.
This is all part of a kit I will take to Alaska this year.
For traveling with a 6x7, I use a Lowepro Photo Trekker classic as my main carry-on, plus a briefcase (no briefcase going to Alaska). Again, the tripod goes in a checked bag.
Rick “who seems to have a different bag for every travel situation” Denney