We had an aquatainer for afew years and it worked well.
We got the 8 gallon hydroroller and got rid of the aquatainer.
That hydroroller has leaked from the threads ever since we got it.
I even contacted the company and ordered and paid for a new cap and spout. Still leaked.
Last year I tried teflon tape, less leaking, but still leaked.
There is a linear seam (two sides of the plastic unit fuses together)that runs perpendicular to the treads. I think it may be the source. We generally leave the thing home, unless we need to haul extra water, and then we keep it vertical until we use it, then we tip it so the spigot will work.
Very dissappointed in this product.