SBQ: Floss & kits

When you stitch from a kit and use the supplied floss do you have leftovers? If so, how much and what do you do with them? If not, do you usually have just enough or do you have to dig into your stash to finish?

I do mostly smaller bookmark/card kits. I've usually had more than enough floss to finish. Usually they just go back into the packaging, especially if they don't give a DMC equivalent.

The only big kit I've used is Teresa Wentzler's "Romeo & Juliet". I haven't gotten far enough to run out just yet. Usually though I'll dig into my stash for more, if it comes to that.