Overview

When customers order bundles, the individual items appear as separate line items on orders. You may want to show which bundle each item belongs to for:

Packing slips — Help fulfillment staff identify bundle items
Order confirmations — Show customers their bundle structure
Shipping notifications — Clarify what's in the shipment

MOD Bundles uses Shopify's native Bundles API, which stores bundle membership data in a groups property on each line item. You can access this in Liquid templates.

How Bundle Data Is Stored

When a bundle order is placed, Shopify automatically adds bundle information to each component line item:

Property	Description
`line_item.groups`	Array of bundles this item belongs to
`group.title`	The bundle product's name
`group.id`	The bundle's unique identifier

This is Shopify's native bundle structure—no special configuration needed.

Adding Bundle Info to Packing Slips

Step 1: Open the Packing Slip Template

Go to Shopify Admin → Settings → Shipping and delivery
Scroll to Packing slips
Click Edit on the packing slip template

Step 2: Find the Line Item Loop

Look for code that loops through line items. It typically looks like:

{% for line_item in line_items_in_shipment %}

Within this loop, find where the item details are displayed. Look for:

{% if line_item.variant_title != blank %}  <span class="line-item-description-line">    ###{{ line_item.variant_title }}  </span>{% endif %}

Step 3: Add the Bundle Info Code

After the variant title section (after the {% endif %}), add:

{% for group in line_item.groups %}  <span class="line-item-description-line">    Part of: ###{{ group.title }}  </span>{% endfor %}

Step 4: Save and Test

Click Save
Open an order containing a bundle
Click Print packing slip to preview
Verify bundle names appear under component items

Full Example

Here's what your packing slip template might look like with bundle info added:

{% for line_item in line_items_in_shipment %}  <div class="flex-line-item">    <div class="flex-line-item-description">      <p>        <span class="line-item-description-line">          <strong>###{{ line_item.title }}</strong>        </span>        {% if line_item.variant_title != blank %}          <span class="line-item-description-line">            ###{{ line_item.variant_title }}          </span>        {% endif %}      </p>      {% for group in line_item.groups %}        <span class="line-item-description-line">          Part of: ###{{ group.title }}        </span>      {% endfor %}    </div>    <div class="flex-line-item-quantity">      ###{{ line_item.quantity }}    </div>  </div>{% endfor %}

Customizing the Display

Different Label Text

Change "Part of:" to match your brand voice:

{% for group in line_item.groups %}  <span class="line-item-description-line">    Bundle: ###{{ group.title }}  </span>{% endfor %}

Or:

{% for group in line_item.groups %}  <span class="line-item-description-line">    Included in "###{{ group.title }}"  </span>{% endfor %}

Add Visual Styling

Make bundle labels stand out:

{% for group in line_item.groups %}  <span class="line-item-description-line" style="color: #666; font-style: italic;">    ↳ Part of: ###{{ group.title }}  </span>{% endfor %}

Include Bundle ID (for internal use)

{% for group in line_item.groups %}  <span class="line-item-description-line">    Part of: ###{{ group.title }} (ID: ###{{ group.id }})  </span>{% endfor %}

Adding to Order Confirmation Emails

You can use the same approach in order notification emails.

Step 1: Open Email Templates

Go to Shopify Admin → Settings → Notifications
Click on the notification you want to edit (e.g., Order confirmation)

Step 2: Find and Modify

Look for the line items section and add the same line_item.groups code:

{% for group in line_item.groups %}  <p style="color: #999; margin: 0;">    Part of: ###{{ group.title }}  </p>{% endfor %}

Where This Works

Template	Works?	Location
Packing slips	Yes	Settings → Shipping and delivery
Order confirmation	Yes	Settings → Notifications
Shipping confirmation	Yes	Settings → Notifications
Shipping update	Yes	Settings → Notifications
Draft order invoice	Yes	Settings → Notifications

What You'll See

Before (without bundle info)

Blue T-Shirt - MediumBlack T-Shirt - LargeWhite T-Shirt - Small

After (with bundle info)

Blue T-Shirt - Medium  Part of: Summer Essentials BundleBlack T-Shirt - Large  Part of: Summer Essentials BundleWhite T-Shirt - Small  Part of: Summer Essentials Bundle

Troubleshooting

Bundle info not appearing

Check the order is a bundle order — Regular product orders won't have group data
Verify the code placement — Must be inside the line items loop
Test with a new order — Changes only apply to packing slips generated after saving

Wrong class name

If your theme uses different CSS classes, adapt the code:

{% for group in line_item.groups %}  <span class="your-custom-class">    Part of: ###{{ group.title }}  </span>{% endfor %}

Check your existing template for the class names used.

Groups array is empty

If line_item.groups is empty:

The item may not be part of a bundle
The order may have been placed before using MOD Bundles
There may be a sync issue—contact support if persists

Additional Resources

For more advanced customizations, refer to Shopify's official documentation:

Bundle Info on Packing Slips