are there any carto tanks yet that are easier to refill?

I’m guessing advancements are being made but I’ve looked at the main vendors I use and the refilling portion of it hasn’t seemed to come very far. I’m guessing there is some cool stuff out there but I obviously don’t know where to look. I heard about tanks that had holes in the top just for refilling them. Anyone know what those are? The ones I use, I have to pull the carto out of the bottom then tilt it and pour it in, carefully avoiding getting into the top of the carto.

There has to be a better one out there!


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