For those that have an EXTRA ball in tow and nowhere to secure it, here is the answer to your problem.

The RG Caddy easily straps to any telescoping handle no matter the brand of bag.
 

Material 

600 denier polyvinyl fabric
 

Features

• Reinforced Zippers
• Adjustable Velcro Flap System Provides Secure Attachment to Most Telescoping 2-Ball & 3-Ball Roller Handles
• Zippered Accessory Storage Compartment
• Embroidered Brand Logos