# Post-purchase accessory upsell: +3% AOV, 15% of orders add it

- Outcome: Won
- Page type: Post-purchase (Ecommerce)
- Elements: Upsells & cross-sells
- Test run by: [Cooper's Treats](https://liftarchive.com/practitioners/cooper-s-treats/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://upsell.com/case-studies/how-coopers-treats-increased-aov-by-3-with-reconvert
- Page: https://liftarchive.com/test/gap-coopers-treats-accessory-post-purchase/

Cooper's Treats started offering its treat-mold accessory right after checkout, and AOV rose about 3%, with over 15% of orders adding the accessory. Founder Alex Willen set this up on the brand's own store, and it was published as an Upsell.com (formerly ReConvert) case study. This was a before-and-after rollout, not a split test.

## Result

**+3% AOV, 15% of orders add it**

- Over 15% of orders now include the accessory add-on.
- About 3% lift in average order value.
- Founder reports first add-ons arrived within a day of launch.
- No control group, sample size or timeframe was shared.

## Control

No offer after purchase. The accessory was not pitched once the order was placed.

## Variant

A one-click upsell and thank-you page offer for the treat-mold accessory, shown right after checkout.

## Why it likely won (our reading)

- The mold is needed to make the frozen treats at home, so it fits the main product closely.
- Asking once, right after purchase, avoids cluttering the path to checkout.
- One-click acceptance removes the need to re-enter payment details.
- The AOV lift is modest because the accessory is likely cheap compared with the main order.

## Caveats

Before-and-after result published by the app vendor, with no control group, sample size or timeframe. The store does five figures a month, so the numbers come from a small business.

## How to run this test

- Hypothesis: If we offer the product's companion accessory as a one-click upsell after checkout, then AOV will rise because buyers who just committed want to get the most out of what they bought.
- Primary metric: Average order value
- Guardrail: Refund rate
- Guardrail: Support tickets about duplicate charges
- Guardrail: Repeat purchase rate
- Who should test it: Single-product or small-catalogue stores with one clear accessory. It won't help much if the accessory is already bundled or bought by most customers.

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Credit: Cooper's Treats ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/gap-coopers-treats-accessory-post-purchase/).
Usage: Free to use, quote and build on, with credit and a link: name the practitioner or organization that ran the test and link to its LiftArchive page. The results belong to the practitioners who ran and shared them; the summaries and commentary are LiftArchive's.