How to Add Build Your Box to Your Shopify Product Page

The most common message we get about this feature is some version of "I created the box but nothing shows up on my product page."

Nine times out of ten, it's the same cause. The bundle exists in the app, and the app block was never added to the theme. Those are two separate steps, and the second one is easy to miss because nothing warns you about it.

So here's the whole thing, in order, including one setting that can quietly break checkout on stores using a third-party checkout provider.

When a build-your-own box beats a fixed set

If you sell perfume, skincare, gift items, or apparel separates, customers usually arrive with a preference already formed. They don't want your set of four. They want their four.

Build Your Box lets them pick, while you keep control of the price, the minimum item count, and the inventory behind it.

I'll be honest about where it doesn't win. A Fixed Bundle is still better for a curated gift set where the exact contents are the product. Build Your Box wins when the shopper knows their own taste better than you do.

Two things merchants tell us about it that don't show up in the pitch:

• Slower-moving SKUs move when you list them next to bestsellers as box options. They stop being a clearance problem and become part of a set.

• The data is genuinely useful. What people pick when given a free choice tells you which pairings actually exist, not the ones you guessed at.

Step 1: Create the box in the app

In your Shopify admin, open AI Product Bundle Builder and:

1. Go to Bundles

2. Select Build Your Box

3. Click Create

4. Configure the settings below, then Save

The three settings that decide whether it works

Step 2: Add the app block to your theme

In your Shopify admin, go to Sales Channels → Online Store → Themes

1. Click Edit theme on your published theme

2. From the top bar, choose Products → Default product, or whichever template your live product pages use

3. In the right sidebar, open Product information

4. Click Add block, then Apps

5. Pick the Build Your Box block under AI Product Bundle Builder

6. Drag it into position. Just above the Add to Cart button performs best, or directly under Buy Now

7. Save

This needs an Online Store 2.0 theme, and the app embed has to be switched on in your theme's App Embeds section. Quick test for whether your theme qualifies: if you can add app blocks from that same sidebar, you're on OS 2.0.

Prefer to watch it? Full setup walkthrough on video.

What the shopper actually sees

The widget loads on the product page with the available items laid out. As they tap items, each one drops into a running selection bar inside the widget, so the box visibly fills up.

Once they've hit the minimum, they submit. Everything goes to cart together with the discount already applied at checkout.

Mobile works as-is, with no separate configuration. Two things it does not do right now: saving a box to finish later, and subscription boxes on a recurring schedule. If either is central to how you sell, that's a real limitation and you should know it before you build a campaign around this.

The percentage discount problem with third-party checkout

This is the part that costs people a weekend, so read it before you launch.

Percentage-based discounts rely on dynamic discount syncing. Some third-party checkout providers don't support that, and the discount doesn't carry through correctly.

The fix is a structural one. Use a fixed-price bundle with a main product selected. The cart then receives a single parent product, and the individually chosen items ride along as child items your fulfillment team can read straight off the order page.

The order arrives looking slightly different. In exchange, there's no discount syncing to fail.

Questions merchants ask us

Does it work with GoKwik?
Yes.

Does it work with Shiprocket?
Yes, as long as you set it up with a fixed price and a main product selected. That order structure is what Shiprocket expects.

If a main product is selected, how does my shipping team know what the customer picked?
The chosen items land as order note attributes, visible on the order page itself. Nobody has to look anything up.

Does inventory still track correctly when items come through as note attributes?
Yes. The app syncs inventory for those items regardless of how they appear on the order.

Do I need a developer?
No. App admin and theme editor, no code.

Is it on the free plan?
Yes.

Try it on your store

Setup runs about ten minutes once you know which product template your live pages use. Start with fixed price, set the minimum at three items, and watch what customers pick in the first week.

If your store needs something the standard setup doesn't cover, a different order structure for your warehouse or a specific discount behaviour, that's the kind of work we do.

• Get AI Product Bundle Builder on the Shopify App Store

Need Build Your Box to work a specific way for your store? Tell us what you need.