First off, I run heavy tubes. Then, 21" tube for front or rear, carry it in a fender bag (front) made for the purpose. Also have room to stuff a CO2 kit, six little bottles. But I've never used it. Really. Not in 40 years have I had a flat offroad.
I probably just jinxed myself royally...
I do run minimal pressure, 14 front, 12 rear, thick walled tires with rim protection. In big rocks I might run a bit more.
Heb Dduw, heb ddim; Duw a digon
I'm that gun-totin', farm-raised, evangelical, pro-environment, OHV ridin'/drivin', Southern civil rights pro-labor Liberal yo' momma told you couldn't possibly exist.