Fenders must be one of the most finicky accessories for a bike to set up correctly, and the thought of even finding fenders that would fit a 29+ (three inch) wide tire seemed fruitless. Let’s just call it what it is: somewhat of a niche market. There are a few fat bike fender/mud guards available, but they’re huge and heavy, and actually too wide – like these offerings from Portland Design Works, for what I want.
Finally, I found on Amazon these puppies: FIFTY-FIFTY Adjustable Mountain Bike Fender. Never heard of this company (fifty-fifty is a skateboard trick… right?), so I’m sure it’s just so rando Chinese brand. But, the price was right, and it seems like it would fit, so I ordered two, and gave it a try, on my last bikepacking trip.