How to split WooCommerce carts into shipping packages

Decide what creates a separate package. Common rules include product category, shipping class, warehouse, supplier, temperature requirement or a specific product list. Also decide whether each package should show its own shipping methods and whether every package must have a rate.

Do not confuse packages with multiple shipping addresses. Packages normally use the same customer destination but receive separate shipping calculations. Shipping labels can also be split after an order is placed, which is a fulfilment task rather than a checkout package rule.

Go to WooCommerce → Settings → Shipping and check the zones, destinations and methods that should apply to each package. Configure the rates before splitting the cart, because WooCommerce calculates shipping separately for every package passed to the shipping system.

Test the destination you actually sell to. A package can show no rate if its destination does not match a shipping zone, if a method excludes its contents, or if a carrier integration rejects the package data.

WooCommerce passes the cart to shipping as one package by default, but developers can split it with the woocommerce_cart_shipping_packages filter. The callback must return an array of package arrays, with each package containing the matching cart items and the destination data used for the original cart. WooCommerce then calculates rates for each returned package.

Put the callback in a small custom plugin or a child theme rather than editing WooCommerce files. Preserve the original package structure, move each cart item into exactly one package, and keep values such as destination and contents_cost accurate. This route is fine for a fixed rule, but it becomes difficult when rules depend on several conditions, quantities, product variations or carrier-specific packaging.

Add products from two different package groups and open the cart and checkout pages. Confirm that every item appears once, that each package has the intended contents, and that a shipping choice is shown for each package. Change the postcode, country and quantity to force WooCommerce to recalculate the rates.

If you use the Cart or Checkout block, check the visual labels as well as the prices. WooCommerce supports the package filter in block-based checkout, but there have been cases where separate rates appeared without a clear visual indication of which package they belonged to. A shortcode checkout can provide clearer package separation, depending on the rest of your setup.

For the fast route, install WooCommerce Advanced Shipping Package, activate it, and open its shipping-package settings. Create one rule for each group of products, give the package a useful customer-facing name, and choose the conditions that decide which items enter it.

Configure the shipping methods or carrier rates for each package, then enable a fallback package for items that match no rule if the plugin provides that option. The documented WooCommerce package workflow supports separate package contents, names and rates, with conditional rules controlling when packages are created.

Test a cart containing only package A, only package B, both packages, duplicate quantities, a virtual product and an item that matches no rule. Check the cart, checkout, order details, emails and fulfilment process.

The common Friday problem is a rule that splits the display but leaves one package without a valid rate. Also check that no item is silently dropped or placed in two packages, and that your payment, tax, carrier and order-management extensions understand multiple shipping rates.