Looks like a Peli 1030 would be a lovely fit for the bits you can see on the rough image below (I know it's terrible taking a photo of a monitor!).
Not much else would fit in there, but I am tempted! The Provari box includes the tank and tip/tool, so fully assembled. Now the hard choice between form and function come into play
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I like the idea of the box too, but I'm hardly an expert. I googled, and it appears the box is airtight, waterproof, and sturdy enough to take being driven over, at least that's what one picture hinted.
If you're into water sports, boating/fishing, or hiking, climbing, etc. It might be a good thing to have something waterproof, and a little more durable.
I know someone who lost their iPhone, it was in a water tight case, and had been run over by a car...(lost on a parking lot) the case was damaged and cracked, but the phone intact when returned....yes, it was actually returned by the stranger who found it.
One thing worth mentioning regarding airtight cases..., and I'm no expert here either, but if you have the misfortune to have a battery vent, if it is in a sealed container, the sealed container can (for lack of a better word) explode. Maybe someone will add to that, but it's my understanding that batteries should not be sealed in completely air tight containers.
Just research and use your own best judgement there.
I would take the ego case (completely) out of the running. The ego case is perfectly fine for an inexpensive case, but it's not going to be a long lasting solution. (My zipper seems less than sturdy.)