Bundle [is_bundle] Field for Product Feed

Required if you've created a bundle containing a main product

The is_bundle attribute tells Google that your product is a retailer-defined bundle — a main product sold together with different, complementary products for one price. This helps Google display your offer in the correct context.

When to use

• Required for free listings and Shopping ads if you’ve created a custom bundle and are targeting:
  Australia, Brazil, Czechia, France, Germany, Italy, Japan, Netherlands, Spain, Switzerland, United Kingdom, United States.
• Not used for manufacturer-created bundles or single products.

Format

Follow these formatting rules so Google can understand your data.

• Type: Boolean
• Supported values (Text/XML): yes, true, no, false
• Repeated field: No

Example formatting:

Minimum requirements

• Submit yes if your product is a custom bundle with a main product and different accessories.
• Ensure all items are complementary — e.g., a camera with a lens and bag.
• Do not use for manufacturer-created bundles.
• Do not omit the field if your product is indeed a custom bundle.

Best practices

• Describe the entire bundle in your title, description, and image.
• Use the correct condition — if any included item is used, set condition to used.
• For customized bundles (e.g., engraving), still mark is_bundle as yes.

Official Source: https://support.google.com/merchants/answer/6324449