These reservoirs are a greaat size. Using them with all sorts of set ups. I picked a couple of them up just last month for 15 bucket system, works like a charm, without all those big costs the larger reservoirs can be. Noticing the tough plastic, that would last for a long time, something like a rubbermaid, but tougher. Also comes with a tight fitting lid, cos you do not want light or air to hit the reservoir water.