A product bundle is two or more products sold together as a single offer, usually at one price that is lower than buying the items separately. Bundles range from fixed sets, such as a gift box of three candles, to build-your-own offers like “any three for £30”.
How product bundles work
There are a few common types:
- Fixed bundle. A set combination at one price, such as a shampoo, conditioner and hair mask set.
- Mixed bundle. Items available individually and also together at a saving. This is the most common online.
- Build your own. The shopper picks a set number of items from a range for a fixed price.
- Add-on bundle. A main product with optional accessories offered together on the product page, often shown as “frequently bought together”, which overlaps with cross-selling.
On the technical side, some platforms treat a bundle as its own product with its own SKU, drawing stock from the components. Others use an app that applies a discount in the basket when the right items are added. The first gives the bundle its own page and listing; the second is simpler but harder to advertise.
Stock needs care. A bundle is only available while every item in it is in stock, so its availability should follow the scarcest component automatically. For Shopping ads, Google Merchant Center has an attribute for marking a listing as a merchant-defined bundle, which tells Google that a main product is being sold with extras.
Why it matters
The main reason to bundle is to raise average order value. A shopper buying one item may happily take two related items at a modest saving, and a larger basket spreads the cost of delivery and of the ad click that brought them.
Bundles also help gift buyers, who often want a complete, ready-made present, especially around Christmas, Mother’s Day and Father’s Day. They can lift a basket over a free delivery threshold, which removes a common reason to abandon the checkout. And because a bundle has its own price, it is harder to compare directly with competitors selling the same individual items.
The risk is margin. A 15% discount on a bundle can cost more profit than the extra items bring in, particularly if shoppers would have bought two of the three items anyway. Any saving you advertise must also be real: “save £12” needs to be measured against prices the items genuinely sell for individually.
Common mistakes
- Bundling slow-moving stock with a bestseller, which can make the bestseller less appealing.
- Discounts set by feel rather than calculated against margin.
- Bundle stock not linked to its components, so a bundle sells when one item has run out.
- Savings claims based on prices the items were never really sold at.
- Too many bundle combinations, which slows the decision instead of speeding it up.
- No tracking of bundle sales in GA4, so nobody can tell whether bundles grew order value or simply replaced full-price sales.
How to act on it
Export three to six months of orders and look for products that are often bought together. Those pairings are your first bundle candidates, because the demand already exists. Create one or two bundles, price them so the saving is clear and the margin still works, and link their stock to the components.
Decide where each bundle lives. A gift set deserves its own product page with its own photography and description. An accessory add-on usually works better on the main product page and in the basket. Run the bundles for long enough to cover a few weeks of normal trading, then compare average order value and margin with the period before.
A well-priced bundle gives a paid social campaign a clear offer to lead with, and I build bundles into creative and catalogue planning when running Facebook and Instagram ads for online shops.