Curated Accessories Bundle and Smart Selection for Identifying the Higher-Converting Audience

Hypothesis: Replacing the cart drawer's single full-price tumbler upsell with a smartly-sized accessories bundle — chosen by an algorithm that lands the combo's sum just under the free shipping gap — will earn more shoppers across the threshold.

Brand of the Week

Stanley 1913 is the tumbler company whose Quencher cup turned a century-old camping brand into a viral retail phenomenon, with reported annual revenue jumping from roughly $75 million to nearly $750 million in the span of a few years.

They make insulated stainless steel cups, bottles, and accessories, sold in a rotation of vibrant colorways that function more like fashion drops than housewares releases.

At the core of Stanley's growth is unusual shopping behavior. Most sessions on stanley1913.com start with the product already chosen — the shopper knows they're there for the orchid Quencher, or the lavender one, or the one their friend just posted.

That makes the cart drawer do a different kind of work than at most stores. It's not trying to convince the shopper to buy. It's trying to help them finish — and ideally, finish in a way that earns Stanley more revenue or fewer abandoned carts.

The structural challenge sitting behind the cart drawer is a math problem. Stanley's free shipping threshold is $75. Their tumblers retail between $33 and $50. Which means almost every shopper who adds a tumbler lands somewhere between $25 and $40 short of free shipping.

The gap isn't an edge case — it's the default state of nearly every cart on the site. Which is exactly why what we found in the cart drawer stood out.

The challenge

We took a peek at Stanley's cart drawer, and two things caught our attention.

The free shipping gap is almost guaranteed. With a $75 threshold and a $33–$50 product, nearly every first-time add-to-cart leaves the shopper meaningfully short of free shipping.

That's not an occasional design challenge for an edge-case cart — it's the default state of the cart on most visits.

So the cart drawer's design isn't optional polish. It's the front line of whether the shopper gets to free shipping, eats the fee, or abandons the cart entirely.

The current upsell makes a real bet on a real audience — but it's only one of two. Stanley's cart drawer currently tries to close that gap by recommending another full-price tumbler ($37–$50). That's a real bet on the "shared purchase" audience — couples, parents and kids, gift buyers, friend groups — for whom a second tumbler in a complementary color is the most natural add.

But there's a second audience hitting the same drawer that the current setup misses entirely: the "complete kit" crowd — solo shoppers who'd rather round up to free shipping with low-cost accessories (a lid, a straw pack, a boot and straw cover).

For them, a $40 second tumbler is a non-starter. A $24 bundle of accessories sized to the exact gap is the round-up they were looking for.

Which audience is bigger isn't a question to settle by gut feel. It's a question to A/B test.

So what would we A/B test?

Control: Stanley's current cart drawer — a single full-price tumbler upsell. The "shared purchase" bet, exactly as it ships today.

Variant (built in MidaGX): A curated 3-item accessories upsell. The "complete kit" bet.

Replace the single full-price tumbler with a smart-selection accessories bundle

The single-product upsell gets replaced with a curated set of three low-cost Stanley accessories — typically a replacement lid, a straw pack, and a boot and straw cover.

The combination is chosen by a smart-selection algorithm that picks whichever combo's sum lands closest to the shopper's free shipping gap without overshooting.

So if a shopper is $27 short, the algorithm picks a combo near $24. If they're $40 short, it picks a combo near $37.

The suggestion feels purposeful and tailored rather than random.

Add a one-tap "Add all · unlock free shipping" CTA with auto-hide logic

Right beneath the suggested combo sits a one-tap "Add all · unlock free shipping" button. One click, three items added, threshold cleared, free shipping unlocked.

And the whole module is conditional — if the cart already qualifies for free shipping or is empty, it auto-hides, so the drawer stays clean for shoppers who don't need it.

Our hypothesis

We don't think either upsell is obviously wrong.

Stanley's current cart drawer makes a real bet on a real audience — shoppers buying a second tumbler for someone else, or for themselves in a different color. That's a meaningful share of Stanley's traffic, and the team has clearly designed the upsell with them in mind.

But we'd expect there's a second audience the current setup misses entirely — solo shoppers who'd happily accept a smartly-sized accessories bundle as the round-up to free shipping, but won't accept a $40 second tumbler.

By running this as an A/B test, Stanley's team would learn three things at once: which audience is bigger, how much AOV each upsell unlocks, and whether the variant changes the cart-to-checkout conversion rate.

The CRO principle underneath

Free shipping thresholds work differently for different shoppers. And the only way to know which upsell unlocks more value is to put both in front of real traffic.

The reason is structural — thresholds amplify the difference between audience segments. A shared-purchase shopper and a complete-kit shopper want different things from the same cart drawer, and the gap between what they'll accept can be meaningful percentage points of conversion.

Prescriptive "best practice" advice will tell you to ship the accessories bundle. Real testing will tell you whether your audience actually agrees.

That's why the cart drawer is one of the highest-leverage places to run a real A/B test, not just ship a default.

Want to run a test like this on your own site? Get started with Mida for free — now available even if you don't have an account with Mida.