Two layers of 4 mil plastic liner. Two threaded PVC fittings. 140 gallons of rainwater.
![WoodwardBench](http://secondrain.com/wp-content/uploads/2016/07/WoodwardBench-300x273.jpg)
You could fill it up and jump on it, but we recommend using it inside a bench like this (plans available in the 140gal DIY kit).
btw Scott is 190 lbs (ok 200+ after Thanksgiving). Really, please don't jump on the liners. This was just for testing purposes...
![Liner-pounce](http://secondrain.com/wp-content/uploads/2016/07/Liner-pounce-300x177.jpg)
(but it was pretty fun)
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