Home Depot toolbox for me, with a seal that keeps water out but isn't "waterproof" per se. But then I have it for shore diving so it lives in my truck.
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So far mine is still pretty basic. https://www.amazon.com/Oceanic-Scub...sk+box&qid=1618149823&s=sporting-goods&sr=1-6
View attachment 652901
I use a US military ammo can of the below size.View attachment 652964
It can easily accommodate all the tools and metal hardware (spare D rings, weight stops, rebreather calibration kit etc) and I just use 3 small plastic organizers (that also fit in the ammo can) for more fragile stuff and o-rings. I have been using it for 15 years and I would never switch to other tool box. I got some for my cave diving buddies and they all love it as well. Another good thing is that it has a rubber gasket on the lid that makes it waterproof, so don't have to worry about water splashing on the boat or rain. You can get those online very cheap or if you have a buddy in the military might be even for free. If you don't like the green color, just spend another 3 bucks on a spray paint to turn it whatever color you like.
VR
Roland