I don't have one of these but the prices are good and with Costco's generous return policy I'm thinking about getting one.

There are 4 different sizes.

https://www.costco.com/.product.100240989.html

Thanks for the detail measurements.  I don't need a cover for my DB, but I have read that Costco grill covers work great as bike covers.

Saw a cover in-store today. It seems pretty durable.

Mice crawled up my grill cover and nested inside my grill when the cover came close to the ground.  It creeped me out.  I took it to the coin operated car wash.

I cut it off higher than I think they can jump.  On most grills there's no need to cover them completely to the ground.