Yeah, I don't think you'll want clip-ins for bikepacking. It's too easy to lose your balance at slower speeds with the extra weight plus you'll likely have walking sections so will want shoes or...

Can you get a 4" wide fat tire in 29"? I only see them in 26". For 29", it appears 3" wide is about the fattest you can get.

I really don't know. I think they're mostly, if not all, 26" but I'm not an expert.

Here's another bike that same guy took on a trip this year. He rode the Baja Peninsula from the CA border to Cabo San Lucas. This bike has a 3" rear and 3.25" front tire and is a 27.5" frame.
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I think with a bunch of gear, fat is the way to go. My buddy weighed about 215 at the beginning of that ride and didn't have any issues with climbing. With the terrain, mud, some snow, etc. with all...

This might be helpful, too. This is his equipment list of what he took on that trip. He rode for about 10 weeks when he did this trip.

Tarptent Double Rainbow
Tyvek footprint
ZPack 850 fill 20...

No worries. I assumed you were one of those I referenced.

Salsa Mukluk

Here's his list of what he had on the bike:

2012 Salsa Mukluk 2 (large frame)
Upgrades:
Surly OD 175mm crank and bottom bracket (38/22)
45NRTH Husker Du tires
Jones Loop...

There are those that would argue it does. Many of them are on this board.

This is what a friend of mine rode from the Mexican border to Banff on the Great Divide Trail.
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This reminded me of Rule #12 of the Velominati: "The correct number of bikes to own is n+1" where n = the number of bikes you currently own.

I also like Rule #5: "Harden the fuck up"

Also,...