This is the best looking off the shelf sub container I have come across. What I mean by best looking is best suited for our intended use.
They are made of some kind of thick plastic resin and are very non resonate. They are 18" tall and the opening is 8.5" ID. Volume is ~33lt. I am going to try a SLS830667, the driver of "Bucket Sub" fame, and see how they sound.
Best yet they cost less than $17 and come in 4 colors...John