Jeffrey wrote:

You can get a cardboard cat carrier from Petco for about $5.
....

Or use a cardboard box with some holes cut in it. Cats have an innate
fear of being in closed-up bags, but boxes and similar containers
(which they can see out of) are less scary.

A beer crate or vegetable container might be perfect. And if he's
jumping onto your lap, he's not as feral as you might think!

HTH

--Karen D.