Snap Calzone is probably quite a good one if you are pushed for space, my mate has one and its really good, I have a POD super crash pad which is awesome but I reckon you would be pushed for space, I only just get it in my Astra.
Well, the Snap Calzone finally arrived: two weeks late and the wrong colour but what the hell!Looks well made abd sturdy and best of all fits nicely on the back seat of my Mini when folded
On mine where you unzip (on one end) to look at the foam - at the end where the zip opens is a little black zip up pouch (on the inside) so you can put your keys there and pop them between the foam...