I use Unicorns for my personal use, and for others who request them. I'm kind of curious as to how many of you fill them. I use ketchup/mustard bottle designs (opaque) that can be purchased at WalMart for $5 for a lot of 3. I can fill 30-40 bottles in about 5 minutes. Just an FYI. I don't use these for storage, only for filling unicorn bottles. The tip fits perfectly.