I love this tip, as I am always traveling with tons of jewelry, and untangling it can be so not fun. It's perfect for keeping those chain necklaces separated and tangle free! I definitely did this for my upcoming trip to Europe. The original idea is here.
Take a straw, and thread the non-clasp end of the chain through it until it comes out of the other side. Now, clasp the chain together. Ta-da!