Crystal Light Containers. I buy it all the time, remove the packages then the label and use the containers for daughters hair accessories, junk drawer (batteries, rubber bands, etc), snacks for road trips.
I know I'll have to say "no," but I think it's good to use positive language when possible. I think it gives more weight when you really have to say "no." Plus it's a bummer for kids to hear "no" all the time.