Great minds think alike. Years ago I went to HD right around this time of year and grabbed the largest tub/tote I could for this very purpose. Every spring HD fills the front swing area with organizational products because we're all supposed to be doing spring cleaning.Not a new tool, but a tool I think worth sharing.
This window washing bucket has become my go to tool for drainage of so many fluids. Great capacity, hard to spill, heavy duty handle, and super easy to transport fluids of all quantities. And the bucket cleans very easy. I have owned this bucket for liley 20 years, and only recently started using as a auto repair tool.
This picture is of the bucket being used to drain coolant from a GX 470.View attachment 147777
Since I've sworn off drain petcocks I just cram the tub under the lower rad hose and pull it.
My tub looks almost exactly the same size, but way more flimsy and no handle.