I can easily get my TM tour bag in the boot although I need to take the driver out as it is a fraction too long. It easily takes my go kart and a carry bag (not the GK and a tour bag sadly) and will take two carry bags.
No reason if you are just using it to transport your clubs rather then store them also you can drop the back seat as and when you need???
I have a fiesta van and keep my clubs and trolley in the boot.