Bundling is a way for you to save on shipping fees by having multiple orders held and shipped together at an interval of your choice. This is a good option for enthusiastic Retropilot customers who order every month and want to save on shipping. If you select "Add to my Bundle and HOLD" on checkout, I'll add your order to a small container with your name on it and nothing will ship yet. This "Add to my Bundle and HOLD" shipping option costs $1 AUD. If you select "Add to my existing Bundle and SHIP" on checkout, I'll add that latest order to your container, and then ship everything in the container to you. This shipping option costs the same as regular shipping for your country. Please let me know if you have any questions about Bundling.