What's great about this rain cistern is that it fits right onto your rain gutter to collect runoff during a storm. Unlike many other rain collecting devices, it really won't take up much space in your yard at all. The watering can easily pops out and can use the spout at the bottom of the cistern to refill. Dimensions: Integrated 5 liter can; 75 liter reservoir. Fill during rainfall with excess falling down through drainpipe.