For easy storage of large water bottles on your paddle board and kayaks! Just like the original Floatsup Cup, the JUMBO installs easily under the bungee cords. Buy the JUMBO size for popular water bottle brands such as Nalgene, Hydroflask, Yeti, Camelbak, and many other popular sizes up to 3.7" diameter. a Innovative flat channel design works with a bungee OR a flat strap. Perfect for paddle boards with flat straps or flat straps on rafts (yes whitewater rafts!) and other watercrafta Made with flexible, durable, 30% recycled TPE material that FLOATSa Interior diameter of 3.7" fits most popular 32 oz water bottles and many other variations