Reddit mentions of Kettle Yanagi Sori -matte finish -Made in Japan

Honestly, this is something I've thought about after buying pieces of shit watering cans.

A handle design/center of gravity so that when tip the can when pouring it balances weight well and is easy to control. That is most important for me.

A spout that doesn't make too wide of a water cone when being poured. I hate trying to water 1 gallon pots and having a wide stream pouring water all over the ground. My current can does this.

Made of a material that doesn't rust.

It shouldn't leak between the stem and the shower head, a lot of cans have this problem where the parts connect.

2.5 gallons or so seems like a good size.

Edit: just read singdog say the same thing.

Also, it occurs to me that a can that is squatter rather than tall may pour more easily. I wonder about experimenting with making the can squatter than most cans as a unique design feature. However, if it's too squat water may slosh out when walking, or be awkard to handle when water shifts around in it. Something to think about.

One more thing. This tea kettle is well known for its design and pours like an effortless ergonomic dream, better design than any other kettle I've used. http://www.amazon.com/Sori-Yanagi-Stainless-Steel-Kettle/dp/B0000DIJ6U. Anyway, notice the unique shape of the stem. I think the fat part at the base of the stem helps balance the pot during the pour. The flare towards the end means you can pour easily at a gentle angle. Also notice the handle is higher toward the front. It's also squatter than a lot of modern teapots. I believe the designer is famous, maybe something to check out.