Posted: Mon Dec 29, 2008 1:56 pm
I once tried what you're doing (and have written about it elsewhere). The interior container does not sit completely inside the outer one---there is a small gap between the two bottoms. When the inside one has water in it, there's nothing to support the bottom and it will (trust me) eventually develop cracks and leak. The containers are not meant to hold water and are prone to leaking anyway (I went through 4 of them in less than a year). The gray ones are more flexible and last a bit longer than those with colors.
To support the container, it would be better to build a frame for it or use pvc pipe placed widthwise inside the container nearer to the top. You'd have to drill two holes to fit each piece of pvc pipe through and cap the ends.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-