I save all my strings in a big plastic container that used to hold pretzels. I actually use my strings more often than I use crumbs. I really enjoy string piecing. But somehow, my strings accumulate at a much faster rate than I can use them. I think they actually breed in there or something. When I make something with strings, it barely makes a dent.
ETA - by strings, I mean the strips 1" or wider. Okay, maybe 3/4" or wider.