I made two of the PVC containers. They have a 6" diameter and are 48 and 54 inches in length. They have never leaked and are bomb proof because I used thick wall PVC. The only downside is they are not light, even empty.
The pipe was cheap, the four caps cost me $75 ( 2 permanent and 2 that have the male and female part to unscrew.)
I took a section of pipe and filled it with a bunch of weight then duct taped the ends closed and threw it around, dropped it off the roof of the house onto some boards etc. I wanted to make sure that it wouldn't break before I invested in the caps.
You had me at 'Hey, Row'