# 30%-off mystery bundles after checkout: £89,337 in 12 months

- Outcome: Won
- Page type: Post-purchase (Ecommerce)
- Elements: Upsells & cross-sells, Bundles & quantity breaks, Pricing, discounts & savings display
- Test run by: [OddBalls](https://liftarchive.com/practitioners/oddballs/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://upsell.com/case-studies/how-oddballs-generated-ps89-337-via-post-purchase-upsells-with-reconvert
- Page: https://liftarchive.com/test/gap-oddballs-mystery-bundle-post-purchase/

OddBalls added post-purchase offers, including 30%-off mystery bundles of slow-moving socks and underwear, and earned £89,337 in extra revenue over 12 months at a 1.92% average conversion rate. OddBalls, a UK underwear brand, made the change on its 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

**£89,337 in 12 months**

- £89,337 in extra revenue over 12 months.
- 1.92% average post-purchase conversion rate, with some segmented offers reaching 5.22%.
- 10,615 extra orders.
- Brand also reports faster turnover of slow-moving stock.
- Mystery bundle results were not reported separately from other offers.

## Control

No offers after checkout.

## Variant

One-click upsells after payment and thank-you page offers, segmented by what was ordered, including mystery bundles of slow-moving stock at 30% off.

## Why it likely won (our reading)

- A mystery bundle at 30% off feels like a deal and a bit of fun, which suits a playful underwear brand.
- Using slow stock in the bundles turns excess inventory into sales without discounting the main range.
- Segmenting offers by order let the best-matched offers convert far above the average.

## Caveats

Before-and-after result published by the app vendor, with no control group. The mystery bundles were one of several offers, so their share of the revenue isn't known.

## How to run this test

- Hypothesis: If we offer discounted mystery bundles of slow-moving stock after checkout, then post-purchase revenue will rise because the deal feels low-risk and fun to buyers who have just ordered.
- Primary metric: Post-purchase revenue per order
- Guardrail: Gross margin on bundle orders
- Guardrail: Return rate on bundles
- Guardrail: Full-price sales of the same items
- Who should test it: Apparel and accessory brands with many designs and some slow-moving stock. It suits less well where buyers need exact sizes or fits they can't pick in a mystery pack.

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Credit: OddBalls ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/gap-oddballs-mystery-bundle-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.