The Cart Popup is the highest-intent surface in your store. It fires when the customer clicks Checkout from the cart page or drawer — they've made the buying decision, they're about to pay, and a single relevant offer at this exact moment lifts AOV more than any other widget. It's a "wait, before you go" moment, except it converts.
Three layouts cover the three psychological angles that work at checkout-time: a single hero recommendation, a mini bundle, or a multi-select add-on list. Each is delivered as a full-screen overlay over the cart.
Layouts
Cart Cross-sell Popup
Single product
Full overlay with one recommended product and a clear Add-to-Order button. The customer can dismiss with one click and continue checkout — no pressure, no friction.
- Last-chance lift before checkout — adds one click to the flow.
- "Don't forget" psychology boosts CVR — the customer was already paying.
- Quick dismiss keeps the checkout flow fast for shoppers who don't want it.
- Configurable position: center, corners, or full-width.
Expected AOV impact: 8–15% AOV lift on checkout-trigger. This is the highest-intent surface in the funnel — the customer was about to pay, so a single great offer here outperforms anything earlier in the journey.
Best for: Stores with a clear hero accessory or premium variant that pairs with most cart contents (warranty, gift box, premium edition).
Cart FBT Popup
Bundle
FBT-style popup at checkout time. Checkboxes for each suggested item, live total that updates as the customer ticks boxes, and a single Add button at the bottom.
- Combines bundle psychology with checkout urgency.
- Customer picks which add-ons they want — no all-or-nothing.
- Optional automatic bundle discount applied through Shopify Functions.
- Works on both the cart page and the cart drawer.
Expected AOV impact: 10–18% AOV lift on checkout-trigger. The bundle savings narrative arriving at peak purchase intent is the single most effective combination in upsell mechanics.
Best for: Categories where buyers tend to forget accessories (electronics, beauty kits, kitchen sets) — the bundle math reminds them what they need.
Cart Add-ons Popup
Multi-select
Checkbox list of optional extras shown right before checkout. Multi-select with one Add-to-Cart click, or a Skip button to keep the checkout flow fast.
- Captures add-ons that get forgotten on the PDP — gift wrap, warranty, samples.
- Multi-select with one click — no individual Add buttons to fumble through.
- Great for warranty, gift wrap, and protection plans.
- Skip option keeps checkout fast for customers who don't want extras.
Expected AOV impact: 5–12% AOV lift on checkout-trigger, with high attach rates (15–35% of carts) on stores with relevant add-ons. Lower per-order lift than cross-sell or FBT, but very consistent.
Best for: Hard goods, apparel, gift-driven categories where small extras (gift wrap, expedited shipping, warranty) are commonly forgotten.
Trigger modes
- Checkout trigger (default) — popup fires when the customer clicks the Checkout button on the cart page or drawer.
- Add-to-cart trigger — popup fires immediately after a product is added. Use the Popup upsell widget for this case.
Position
The popup can render in 9 positions: center, top-left/center/right, middle-left/right, bottom-left/center/right. Center is the default for highest visibility.
Frequency
Built-in show-once-per-session logic prevents the same popup from triggering twice for the same shopper. Returning customers see a fresh trigger after their session expires.
How to install
- Create a Cart Popup campaign and pick the layout (Cross-sell, FBT, or Add-ons).
- Pick the position (center is the default).
- Add the Summer: Cart Popup block to the cart page template — it intercepts the Checkout click automatically.