Dime Challenge

I'm going to try the dime challenge, even though I don't use cash to much when I buy things. I know the picture says to fill up a 2 liter with dimes, but it shows a 20 oz bottle in the picture filled with dimes. 

So, I plan to start filling up a 20 oz bottle with dimes and seeing how much I save up and go from there, since I have a bunch of those around!!!

Do you plan on trying the dimes challenge? Why or why not? 

Are you going to use a 2 liter bottle or a 20 oz bottle? Why did you choose the bottle size you did?

Have you done a challenge like this before?