Profit & margins
Product bundling strategy for online stores
Product bundling means selling two or more products together as one offer, usually at a lower price than buying them separately. Done well, bundles raise average order value, move slow stock and make buying easier. The trade-off is margin: every dollar of bundle discount comes straight off your profit.
Pure vs mixed bundles
| Type | How it works | Example | Best for |
|---|---|---|---|
| Pure bundle | Items are only sold together | A gift box that isn't available as separate items | Gift sets, curated kits |
| Mixed bundle | Items are sold separately and as a bundle | Tee, cap and socks individually, or all three for less | Raising AOV, clearing slow items |
Most online stores use mixed bundles, because customers can still buy the single item they came for.
Other common formats:
- Starter kits: everything needed to start using a product.
- Buy more, save more: multiple units of the same product.
- Build your own: customers pick items from a set for a bundle price.
The bundle margin formula
Bundle price = Combined full price × (1 − Bundle discount %) Bundle profit = Bundle price − Combined COGS Bundle margin = Bundle profit ÷ Bundle price
- Combined full price
- sum of the items' regular prices
- Combined COGS
- sum of the items' costs
Worked example
Worked example: a three-item apparel bundleExample numbers
| Item | Price | Cost |
|---|---|---|
| Tee | $30.00 | $12.00 |
| Cap | $25.00 | $9.00 |
| Socks | $12.00 | $4.00 |
| Total | $67.00 | $25.00 |
With a 15% bundle discount:
- Bundle price = $67.00 × (1 − 0.15) = $56.95
- Bundle profit = $56.95 − $25.00 = $31.95
- Bundle margin = $31.95 ÷ $56.95 = 56.1%
- Profit given up versus selling all three separately = ($67 − $25) − $31.95 = $10.05
The bundle earns $31.95, against $42 if a customer bought all three at full price. It pays off when it sells items customers wouldn't otherwise have added. For example, a customer who came for the tee ($18 profit) and leaves with the bundle ($31.95) is worth $13.95 more.
Product Bundle Discount CalculatorYour real profit on a bundle after the discount, and what you give up per bundle.Bundle pricing approaches
The percentage discount is only one way to price a bundle:
| Approach | Example | What it really costs |
|---|---|---|
| Percentage off | 15% off the three items | 15% of the combined price |
| Round bundle price | All three for $55 | $67 − $55 = $12, about 18% |
| Buy 2, get 1 free | Three $20 items for $40 | One item's price: a third off |
| Free gift with the bundle | Tee and cap, free socks | The gift's cost ($4), not its price ($12) |
A free gift is often the cheapest way to make a bundle feel generous, because you give away cost, not retail value. In the example, free socks cost $4 of profit, while a $12 discount costs $12.
Choosing which products to bundle
- Look at what customers already buy together. Export orders and find products that often appear in the same basket.
- Mix margins. Pairing a high-margin item with a lower-margin one keeps the bundle's overall margin healthy.
- Check stock levels. Don't build a bundle around an item you're about to run out of.
- Keep it simple. Two or three items are easier to understand, and to keep in stock, than six.
Using bundles to clear dead stock
Bundles are one of the gentlest ways to move slow inventory:
- Pair a slow mover with a best-seller. The best-seller brings the traffic; the slow item rides along.
- Use a smaller discount than a clearance sale would need, because the bundle's appeal comes from the combination, not just the price.
- Watch the carrying cost you save. Every month a slow item sits costs money. The dead stock calculator shows how much, which tells you how much discount you can afford.
The guide to dead stock covers other clearance options.
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- Bundle items that belong together. A bundle should make sense to the customer, not just to your stock levels.
- Show the saving clearly, such as "Save $10.05" next to the bundle price.
- Set up inventory tracking for the components so selling a bundle reduces each item's stock.
- Measure what the bundle replaces. If bundle sales mostly come from customers who'd have bought every item anyway, cut the discount.
For more ways to grow basket size, see the guide to average order value.
FAQ
How do I price a bundle?
Add up the full prices of the items, apply a discount that's visible but modest, then check the bundle's margin after the combined cost of the items. If the margin falls below what you need to cover shipping, fees and ads, use a smaller discount.
What discount should a bundle have?
Enough for customers to notice the saving, but no more than the bundle needs to sell. Because the discount comes straight off profit, test smaller discounts first and only go deeper if the bundle doesn't move.
How do bundles work with inventory?
Selling a bundle should deduct one of each item from stock. Not every way of setting up a bundle does this automatically, so check how your bundle app or inventory system handles component stock before launch, or your stock counts will drift.
Are bundles good for slow-moving stock?
Yes, as long as the bundle is genuinely appealing. Pairing a slow mover with a best-seller gets it in front of buyers who are already purchasing, usually with a smaller discount than clearing it on its own would need.