30%-off mystery bundles after checkout: £89,337 in 12 months
Commentary byLiftArchiveOur analysis, not theirsOddBalls 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.
- £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.
The change
Variant adds a discounted mystery bundle and matched offers after checkout.
Simplified mockup drawn by LiftArchive from the shared screenshots.
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 of the result, not the practitioner's claim.
- 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.
Who ran it
OddBalls ran this test for OddBalls and published the results (Upsell.com (ReConvert) case study). The numbers are theirs; the summary and commentary on this page are ours.
Read the original case study on OddBalls →
How to run this test on your store
- 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
- Guardrails
- Gross margin on bundle orders
- Return rate on bundles
- 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.
Questions
Do mystery bundles work as upsells?
They can, because a surprise at a discount feels low-risk.
They work best for low-cost items where any design is welcome, like socks.
Is it smart to use slow-moving stock in upsells?
It can clear inventory without marking down your main range.
Watch returns and make sure bundles don't eat into full-price sales.
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