I've been looking at getting a hard-bottomed backseat extender so my dog has more room to roam and protect my seats and interior from hair, nail scratches, etc. Today's Prime Deal was too good to resist, so I settled on the URPOWER backseat extender, which has a hard bottom and is also convertible if I need to partially fold it up to make room for a passenger.
Here's a direct link: Amazon.com
Here's a direct link: Amazon.com