I have used one. They work but are not lightweight by today's considerations.
If you are thinking lightweight and packable, look at either Mountain Laurel Designs or Gossamer Gear. Of course, you will pay more.

If it's just a matter of coverage in a passing shower, some of the cheap vinyl disposables in garish colors will also work . . .
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Human Resources Memo: Floggings will continue until morale improves.