[rdl]

I have a packet of KN94 in my pack (more for "required for compliance for covid" randomly happening, but also for this), and some gloves (nitrile 2x and 1x mechanicswear for shooting/climbing/hot/cold). Tyvek suit would be more hassle to carry vs. the benefit than I'm willing to do.

[currenciessfe]

You can pack it quite small if you never tried, in the size of an average book, maybe less if you vacuum pack it.

[rdl]

Yeah, bigger than I'd want to carry in the backpack I carry everywhere which also contains 1-2 laptops, trauma kit, etc. I'd just sacrifice whatever clothing was exposed when it happened. There's plenty of other clothing in the world.

[chiefalchemist]

It looks like there are grades of Tyvek - similar to masks? - what's the min level you'd recommend?

[currenciessfe]

For preventing the radioactive fallout from touching you and remaining there any level is appropriate since the fallout is in the form of dust or rain which can't pass through these suits.

Obviously radiation will pass through it, for protection against that you need lead based suits.