I bought a tailored boot tray for my 23 reg Crosstar I've had since March.
It was £27 on eBay and is excellent.
I'd had CRVs for nearly thirty years before that and it was no problem getting my tour golf bag and leccy trolley in the boot.
This car needed a different approach.
On golf days, I lower both back seats and place a heavy duty 120cm x 80cm rubber mat I also bought on eBay for a tenner, across the backs of these seats, which completely protects them.
I can then slide in my golf trolley in its bag, my golf bag next to it and there's still plenty of room for a sports bag, golf shoes, and trolley battery.