There's a measuring gate for us so if you're too fat, probably not a good idea

[theking]

..to go. Plus, gotta consider soil movement and erosion too  :

Woman spends 16 hours wedged in 12-inch cave opening, California rescuers say

It took hours for San Bernardino Sheriff's Office cave rescue team and CAL Fire rescue personnel to reach the woman. A 29-year-old woman was stuck in a 12-inch-wide "gap" in a cave in East County for about 16 hours before rescuers freed her late Sunday morning, a sheriff's official said.

I took these photos of the measuring gate in Utah:

[theking]

Yes, some of the spots are tight for big people:

[theking]

Also used common sense and don't get lost as I've been to several gulch and some runs deep into the canyons. Plus, cell signal is pretty much non existent in many of those areas. A two way radio is good to have just in case:

[Visualmon]

Walkie-talkie and 12 pack of flares are must have survival kit.

[theking]

Besides radios, water and lots of it should be a given...

[Hung_Low]

..to go. Plus, gotta consider soil movement and erosion too  :

I took these photos of the measuring gate in Utah:

That excluded 99% of American adults