This is one cup of uncooked rice.*
I am not going to dump it over my head or dare you to. That would be wasteful and stupid.
I'm also not going to employ upon you peer pressure tactics I thought we'd all left behind in sixth grade. I respect you too much.
A masu was the amount of rice needed to feed one person for a day in feudal Japan. That's approximately 2 1/4 cups - enough to fill this measuring cup not quite to the brim. If you've ever cooked rice, you know that this would cook up to more than seven cups. Supplement with greens or other vegetables and a bit of fish or some beans and suddenly the humble masu seems like a realistic measure after all.
In modern currency, a pound of rice costs about a dollar, maybe more if it's a fancy variety. $20 is the going rate for a 20 pound bag of Botan Calrose rice at Walmart.
Amyotrophic Lateral Sclerosis is a nasty thing and if you choose to donate, that's great. The thing is, your donation won't cure ALS tomorrow. Some day, maybe.
But you could feed someone right away. A lot more people are relying on food banks now than have ALS, and food banks can stretch your donation dollar to as much as three times its size. That's pretty impressive.
If you've read this far, thank you.
*(And me in my dorky reading glasses.)