Tamaki Classic Rice is a favorite of Japanese restaurants. It's a blend of Japanese short-grain rice varietals and has great texture and flavor and embodies Japanese short-grain rice. Tamaki is a Japanese-owned and operated company growing, milling, and packaging their rice in Sacramento, CA. 

To cook rice, here are a few pointers. If you have a Japanese rice cooker, you must use the little measuring cup that comes with it because 1 Japanese cup is not the same as 1 American cup! 

If you lost your Japanese measuring cup or you are cooking rice in a pot or donabe, here's an easy fail-safe formula: Measure out the rice. Rinse it three times under running water. Let it soak in water for 15 minutes. Drain the water and place equal parts rice and water in your cooking vessel and cook. Don't stir it and don't even look at it while it's cooking! Once it's done, give it a gentle 'fluff' with a rice paddle, put the lid back on it, and let it rest for 10 minutes. Then and only then is it ready!

15 lb (I'd consider this a decently large bag. It's probably big enough for you unless you're a Japanese family of 5.)