I have used one of these in the past during a long power outage and it was great. It holds almost exactly the right amount of water for a comfortable shower without being rushed. The flow rate is great and a full bag of water can last for up to 2 and a half showers in my experience. It heats up quite well when exposed to the sun, and the built-in thermometer lets you know when it is ready. No leaking at all. The opening where you fill the bag is much more sturdy and there is a nifty built in thermometer. Was perfect for us!