To keep the chain neat and kink-free, wrap it around a business card. Cut two notches at opposite edges of the card and secure the ends in the notches. You may want to label the card with information about source, size, the price, item number.
Variation: Instead of thin business card, I use an old plastic card such as a gift card, a credit card, a membership card. Also, I peel the label from the vendor’s plastic package and place it on the card. So, I have all info about this chain.