A shopper has decided. They picked the shade, they picked the 30-count, and their thumb is near the add-to-cart button. The second item, the one that goes in beside the first, has to meet them somewhere, and before checkout there are two places it can: the page they are reading, or the cart one tap later. Where it lands decides what the shopper is being asked at that moment, and the three stores below answer that three different ways.

The product page, where the offer is always below the button

Not one of the three puts a second item above the add-to-cart button. Only the distance differs: less than half a screen on Bloom, about two-thirds of a screen on Glossier, five and a half screens on Transparent Labs.

Glossier's Futuredew page runs twelve screens, with the main Add to bag $30 on screen 2. Four second-item blocks follow: ADD ON and SAVE WITH SETS on screen 3, BUILD YOUR LOOK across screens 5 and 6, YOU MIGHT ALSO LIKE on screen 8. The first two are rows that open when you tap the plus: Invisible Shield SPF50 and Balm Dotcom each show a photograph, a name and a +, no price, no add button. Tap the plus on Invisible Shield SPF50 and the row opens into Add to bag $32 and See full page.

Bloom's greens page puts its offer in a pair of tabs less than half a screen under the button, and that button rides the bottom of the screen as you scroll before it settles into the page just above the tabs. Pair It With is open by default; Bundle & Save 25% shows nothing until it is tapped. The open tab holds one paired product with its own Add to Cart.

Transparent Labs is the only one of the three that says what the second item is for. Its block is headed Complete Your Stack and opens: Pair Bulk Pre-Workout with these products for a complete foundational stack. Four cards follow, each with a line on what it does; none carries a price or a discount, none has an add button, and all four buttons read Shop Now and link away to that product's own page. The heading sits on screen 8 of 18, five and a half screens below the main Add To Cart. By then a sticky buy bar has followed the shopper down, and at that depth it covers the lower half of the heading.

So only one of the three says what the second item is for, and it is the one you cannot buy from. The others put a phrase on the heading, an outcome (BUILD YOUR LOOK), a pairing (Pair It With) or a saving (Bundle & Save 25%), and none of them writes the sentence that says why this item goes with that one. That is what I saw on what was on screen; the closed rows and the unswiped slides may say more, and I did not open them.

The case for this page is narrower than it looks. It fits one kind of offer: the thing the shopper will need to use what they just chose, the way you sell it. Our July 2026 piece on the seven blocks a product page needs made the point at block seven: the second item should finish the routine your own how-to describes.

The cart, where they see the order for the first time

One tap on each store slid a drawer over the page. The three drawers were not alike.

Glossier's does arithmetic in front of the shopper. You’re $10 away from free shipping, above a bar with two labelled stops, Free shipping and + Free gift. The product page had said Free standard shipping on orders $40+; the item in the bag is $30; the drawer prints the gap, and the $10 moves with the basket. Under the item comes BUNDLE + SAVE: Save on Cloud Paint, $13 against $16, You save 20% by bundling with items in your bag.

Bloom's drawer shows the item you just added and a four-card carousel headed Psst…We Think You'd Love These Too!, each card with its own Add To Cart; only the first card is on screen, and it is the greens powder already in the cart. Transparent Labs' drawer shows the item and a green Free Shipping bar saying the subscription already includes shipping. Neither drawer, the day I opened it, had a free-shipping bar counting down to a threshold, a gift line or a discount box, and Bloom's FREESHIP code from the product page was nowhere in it. Before that reads as a mark against either store: Glossier's bag held a one-time purchase, while the Transparent Labs and Bloom carts each held a subscription that already carried free shipping, so neither had a threshold left to count down to. I saw each cart once, with one item in it, and that is not enough to say whether this is how the store is built or just what happened to be in the cart.

Part of why a cart arrives bare is what the theme gives you out of the box. Shopify's Help Centre says that by default product pages have a Product information section and a Related products section in the theme editor, and that By default, the cart page has an Items section and a Subtotal section in the theme editor. Those are defaults, not limits: the same article says settings depend on your theme's developer and version, and it never mentions the cart drawer, which all three of these stores use.

There is a third place, the page after the order is placed, and this piece does not cover it.

The decision

The rule: complete the product on the page, complete the order in the cart

The offer belongs where the shopper can answer the question it asks. On the product page they are still thinking about the product, so the second item that fits is the one that completes it: one item, named as what it completes, with a price and an add button in front of them. In the cart they are looking at an order for the first time, so what fits is what completes the order: the distance to free shipping, the gift at a spend, the saving for a second unit. Our July 2026 checkout piece already asks for the threshold line; the cart is the place that earns it, because a threshold is a fact about the order and the cart is the first screen that shows one. Three stores do not prove any of this; it is my judgment from what I saw, and I would still bet on it.

That gives you something to check on the blocks you already have. An offer with no price, no button, or a heading that names only a saving asks the shopper to go and find out before they can say yes.

Do this today

Open your store on your phone, not on the laptop. Add your best-seller to the cart and read what you are offered, in the order it comes. Write down three things: where the first add-on block sits, measured from the button; whether its heading names what the second item completes, or only a saving; whether the price and the add button are there without a tap.

Then read the cart. If a free-shipping threshold is printed anywhere on your product page, look for whether the cart turns that number into a distance from the order in hand, the way the $18 away from free shipping line in our checkout piece does. If the cart shows the item, a subtotal and a checkout button and nothing else, that is what a default template ships with, and whether your theme can add the line without an app or code is the question to take to whoever set it up.

Sources:

Storefronts, all opened at phone size on 17 August 2026