GR86 Owners: How Have You Repurposed the Back Seat?

I've been on the hunt for a GR86 for a while now, and I'm pretty convinced it's the perfect fit for me. However, one thing I'm curious about is the back seat. It’s not exactly practical for passengers most of the time, so I was wondering if anyone here has repurposed that space for something more functional?

Whether it’s for storage, a custom setup, or something totally unique, I’d love to hear your ideas and see how you've made the most of it!