Think about this example. In your store, you sell live plants, planters, and plant fertilizer. Many customers who are shopping for a live plant will also want a planter to keep it in. Some customers will also feel the need to buy fertilizer, to give their new little plant the best possible chance at life.
Despite the fact that you sell these three related products, they are likely arranged in separate product catalogs. This means that customers would have to go to the plant section, add a plant to their cart, then go to the planter section to browse planters. Because a majority of customers aren’t specifically visiting your store for fertilizer, they will likely checkout before they make it that far, and you are missing out on valuable revenue.
By including the planter and the fertilizer in a bundle with the plant, you can set up a “new plant starter kit” for your customers – everything they need all on one page. This helps to make your store easy to navigate, and also encourages your customers to purchase more products than they normally would, resulting in a bigger sale and more revenue for you.