Well, I was waiting to post this until I could get a picture, but I am lame and haven't done it yet, so here is the post and a picture may come later.
A while ago (week or so) I got an adorable card in the mail with a teeny tiny sock in it. In Ravenclaw colors even. From my oh so kind spoiler Selena Starfire. She sent it to me for practicing my engorgio spell. Took a few tries, but I seem to have engorgio and reducio down pat. I think that I may have an easier time packing out of Hogwarts than I did on the way in even though I will have more things! I can't believe I didn't think of it before.
I am using my new found skills on all my stuff now. I have a cute little purse that I have been wanting to use and now I can fit all of my school things in it. And other stuff. All my school books. A drawing pad, though sometimes the sketches don't shrink or enlarge with the paper. A couple of novels. It did not work on my knitting but that still fits in there regular sized. And I had to stop shrinking my quills because I kept losing them when they would blow away after I set them on the table to enlargen again.
So thanks Selena. This will be a useful skill for the rest of my life.