3PL & Fulfillment

Fulfill Shopify Bundles with Your 3PL, WMS, or ERP

When a customer buys a bundle, Simple Bundles breaks it into individual component SKUs on the Shopify order so your 3PL, warehouse, or shipping software sees exactly what to pick, pack, and ship.

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How Simple Bundles works with your fulfillment stack

Simple Bundles is a Shopify app that converts product bundles into their individual component SKUs on every order. When a customer buys a bundle through Shopify Checkout, the app uses Shopify's Cart Transform API or the order editing method to split the bundle into separate line items before the order reaches your 3PL, WMS, or shipping software. Each component appears with its own SKU, quantity, and proportionally allocated price. No opaque bundle line items for your warehouse to decipher.

Bundle details can also be written to Shopify order metafields for deeper integration with ERPs, WMS platforms, and reporting tools. Simple Bundles supports real-time multi-location inventory sync across all sales channels.

Why fulfilling Shopify bundles can break your warehouse

When orders flow from Shopify to your 3PL, WMS, or ERP, those systems often treat the bundle as a single SKU instead of a set of individual products. Without the right setup, that limitation cascades through your entire fulfillment workflow.

Your 3PL receives opaque bundle SKUs, not pick lists 📋

Without SKU breakdown, your warehouse sees a single bundle line item with no information about what's inside. That means wrong items in boxes, missing components, and customer complaints.

Inventory drifts between Shopify and warehouse ❌

When bundle sales don't deduct inventory from individual components, stock counts drift. The result: overselling, backorders, and restock orders that eat into your margins.

Shipping weights and rates are wrong for bundles ⚖️

Shopify calculates shipping based on what it knows about the product. If the bundle weight doesn't reflect the combined weight of its components, your checkout undercharges customers.

Works with your fulfillment stack

Simple Bundles passes component-level order data through Shopify's native integrations. Any system that reads Shopify orders gets clean, itemized bundle data. That includes widely used fulfillment and shipping tools such as ShipStation, Cin7, Loop Returns, Zapiet, NetSuite, ShipBob, Order Printer Pro, Amazon MCF, and Shopify Flow.

FAQs

How does Simple Bundles break down bundles for 3PL fulfillment?

Simple Bundles uses Shopify's Cart Transform API or order editing to split bundles into individual component SKUs at checkout. Your 3PL, WMS, or shipping software sees each component as a separate line item with its own SKU, quantity, and price.

Does Simple Bundles work with ShipStation?

Yes. When a bundle order is placed, Simple Bundles breaks it into individual component SKUs on the Shopify order. ShipStation imports these as standard line items with accurate quantities and SKUs, so warehouse staff can pick and pack without guesswork. No custom configuration is needed.

What is the difference between multi-SKU and single-SKU bundles?

Multi-SKU bundles add each component as a separate line item on the Shopify order, making them visible to your 3PL or warehouse for individual picking. Single-SKU bundles keep only the parent bundle visible on the order with no component line items added, but still deduct inventory from each component when sold. Single-SKU is ideal for pre-kitted bundles that ship as one unit. You can still display itemized contents on packing slips using Shopify order metafields.

Can I pass bundle data to my ERP or WMS via metafields?

Yes. Simple Bundles can write bundle details to Shopify order metafields, including parent bundle SKU, component SKUs, quantities, prices, variant IDs, and product images. Any system that reads Shopify order metafields can access this data for downstream processing.

How does inventory sync work across multiple warehouse locations?

Simple Bundles supports two inventory models for multi-location fulfillment. Location-based inventory requires all bundle components to be in stock at the same location—if one component is missing, the bundle is unavailable at that location. Pooled inventory calculates bundle availability using the total stock of each component across all locations, increasing sell-through but potentially causing split shipments. Both methods deduct inventory from component SKUs in real-time when a bundle is sold.

Does Simple Bundles handle accurate shipping weights for bundles?

Yes. In Simple Bundles 2.0, shipping calculations are based on the child product weights within the bundle. You can set up shipping profiles for individual components so Shopify's shipping engine calculates accurate rates. This prevents margin erosion from undercharged shipping and carrier surcharges from incorrect dimensional weight.