Might be good for temporary use but I'd rather a hard plastic drum for long term storage. Drums can be used to support a tabel top, transported with less potential for puncture, plumbed with fittings for using a pump, plumbed in series for larger supply to draw from, no glued seams or folds that can break down over time, impervious to chlorine, and probably cheaper if bought at the right places or scavenged.
Looking at it, it reminds me of the "water proof" bags issued in the army......never had one that didn't develope a leak somewhere. I'm sure these are built tough but I just don't like the idea of storing one and one day finding that it leaked its contents onto the floor.
Might be able to put it in a barrel for support, but then why not just have a drum in the first place?