I think that my extras will begin to go down quickly once I use up that 200 meter roll of plaid that I bought. Once you start backing a lot of charity quilts, the yards/meters go down quickly--very, very quickly. I am getting ready to finish up that whole 200 meter roll. I just bought it a year and a half ago--washed it all last summer, and thought I'd never get to the end of it, but am quickly closing in on it.
So, while I have a lot sitting around (a lot was donated, or I found some at thrift stores while in the states in May), I know that it will go quickly once I start using it for backings.