Golberg Black Shock Cord, Bungee Cord - (5/8 Inch x 50 Feet) - Amazon.com
5/16" x 30 Ft (10 yards) Black Premium Marine Grade Bungee Shock Stretch Cord UV Resistance Heavy Duty for boat Kayak 30'(NOT for face cover making, NO spool) - Walmart.com
Paracord Planet Colored Bungee Cord and Ball Bungee Kits - 10 Feet of 1/8 Inch Shock Cord and 5 Ball Bungees - Make Custom Tie Downs for Camping, Event Tents, Canopies, and More - Walmart.com