Suggestions for a backseat cover?

[Greg the leg]

I'm am looking for suggestions for a backseat cover/ hammock for my 2015 Stone Blue Denali with cocoa/ dune leather that I'm getting in a few weeks that looks good, cover the whole seat and is waterproof. We have a Orvis hammock for my wife's car, it has straps that snaps together and go behind the headrest, front and back. They make that in XL, buts it's like$189.

I used a painters floor tarp with vinyl back folded over two times in my Silverado extended cabs back seat for past 5 years, I had the headrests poke through the tarp and it covered the whole back seat top to floor, side to side. My dogs dirty or wet feet never got through to the seat, but removing it wasn't easy, I had to pop the headrests off (not so easy) when friends wanted to hop in the back seat . The color matched my tan leather pretty darn good and with 4 layers, did a great job and was cheap?.

Anyone have a good idea? Here is my dirty old tarp, time to retire it.

[Spurshot]

I've been using packing quilts.