Waterproof case that seats behind the rear seat in a 2020 TI

Hi all, I recently purchased a 2020 TI and I'm outfitting it for a long distance trip. I'm trying to find a fully waterproof box (ex. pelican case) that will fit behind the rear seat in the inset without impeding the rear hatch. Unfortunately everything I have seen just doesn't have the height/depth to provide ample storage and wisely utilize the space. From my measurements something 16.5 in long and under 13.5 in wide base would fit, but height would need to be about 12-16 to really meet my needs. Im using the the box to store camera equipment, sensitive gear, and a drone as well as to hold my lithium batteries. I have seen a yeti box that would have sufficed (but on the very heavy side) but was about $300. If anyone can suggest a manufacturer or brand to check out that might meet my needs please let me know.

Thanks!

Noah

You might have more luck with a softside bag from EarthPak. I have a 70-liter dry bag and it works great. Comes in smaller sizes too and might conform better to your space requirements.

As Jim mentioned, the soft roll-top closure dry bags (as well as some of the newer truly waterproof zipper access duffels) will be your best options as far as large storage volume and overall space efficiency. I also have an assortment of bags, duffels, and compression sacks from Outdoor Research and NRS that I've used for everything from offshore day trips to multi-day expeditions without any water intrusion issues, and the smaller ones are easy to stow inside your hull hatches as well.
My pelican cases still get a ton of use, though they can present a challenge when it comes to being relatively heavy/cumbersome. They're fantastic for quick access while still providing incredible protection though, so I typically just use a couple of smaller ones (for electronics, phones and keys, etc.) that store underneath and behind the seats, then some mid-sized ones whenever I take camera gear along (the entire 'storm' series from pelican is excellent!) and lash them to the akas. I've only sailed the TI with my largest case twice so far, and admit it felt a bit ridiculous (but it allowed me to bring/ride 'onewheels' in some cool places).