It holds about 60 gallons. Its diverter fits perfectly to the downspout and it allows excess water to pass through the downspout. You can lock the opening lid if you want to which keeps out mosquitoes etc. It comes with a spigot which allows you to fill a watering can etc. and there is also a drain that you can attach your garden hose to, which makes it easy to empty the barrel in winter. They also provide a winter hole cover so the hole in the downspout doesn’t look ugly.

There is video on their website (http://earthminded.com) that makes installation very easy. One of their products is 100% recycled while others are 30% recycled, which as an environmentally conscious person, is very important to me.

You can buy them from their website, but they also list authorized resellers on their website and the resellers offer good deals so I would check them out.