Hi, I have the same setup as you, I just bought and tried this for a week in Cozumel:

https://www.amazon.com/gp/aw/d/B07XTG9LSK?psc=1&ref=ppx_pop_mob_b_asin_title

Works wonders, bottom section is leak proof so you can put your wet gear in there and not get the rest of your backpack wet. Or you can use it as your personal rinse station on the boat. (Haven't tried that, and although the backpack is flexible, it could work). It has plenty of pockets (not waterproof) for whatever you need. I use the top section to store the mask and computer before the dive. While on the boat I use it to store my dry clothes (this section is not water proof, so you may want to use a small dry bag inside or probably a big ziplock would be enough) In the bottom section I can fit the tg6 with housing and 2 Sola video lights, plus if i needed, I could temporarily store the mask and computer while wet. Only thing missing for my use is to figure out a way to hang the fins. Doesn't feel super strong, but not too cheap either. If you are a tourist who drives once or twice per year like me, feels almost perfect.