Weird they gave you such a hard time, I just went through security at O’hare with a pelican case full of batteries, regulators, and can lights with zero issue. I find a friendly “it’s scuba gear” to the x-ray operator helps things move along.
Of course, if you enjoy a good finger f*cking you can omit the friendliness…
Of course, if you enjoy a good finger f*cking you can omit the friendliness…