Product Bundles and a Free Gift by Order Total for OpenCart 2.3, 3 and 4

Product Bundles and a Free Gift by Order Total add a “frequently bought together” block on the product page and an automatic free gift once the order total reaches a threshold. There are three builds: for OpenCart 4.0.2 – 4.1.x, 3.0.2 – 3.0.5.0 and 2.3.0.x; the functionality is identical, only the package differs.

A bundle is triggered by the cart, not a button

A shopper who adds the same items one by one, on different days, gets the same price as one who clicked “buy together”. The discount lives in the bundle rule, not in the button, so it can’t be “lost” by entering the shop from a different angle.

The discount is a separate line in the totals

Line item prices aren’t rewritten — the bundle adds a separate named line to the order totals. So it’s clear exactly what the discount was for: it carries through to checkout, prints on the invoice, and can be pointed to on a return.

One unit of stock can’t be discounted twice

If two bundles overlap, the same physical item won’t receive both discounts: units are “consumed”, and the bundle with the higher priority wins. The discount itself is capped at the value of the items it covers, so no rule can push the order total into the negative.

Gift by order total

The gift is added and removed automatically as the shopper changes the cart, has a badge and a lock on its line, and there’s a hint nearby: “add another N UAH”. It’s an ordinary catalogue item, paid for by that same totals line, not a zero-price duplicate — so stock and reporting stay correct.

The limits you’d normally need

• Restrictions by customer group, store and validity period.
• Quantity of each item in the bundle, required and optional items, its own price within the set.
• Discount as an amount or a percentage, with visible savings shown on the product page.

Why a shop needs this

Bundles work well where a product is rarely bought alone: a phone and a case, a drill and a set of bits, a cream and a remover. The shopper already knows this, but won’t go hunting for the second item in the catalogue — so a “frequently bought together” block right on the product page raises the average order value without any discount on the main item.

A gift by order total is a different tool: it doesn’t raise the order value on its own, it pulls the cart up to a threshold. Someone with 850 UAH in the cart, seeing “150 more to unlock the gift”, is more likely to add something than to leave.

What it looks like for the shopper

Below the price on the product page, a block appears with the second item (or several) and the bundle price. It shows how much each item costs separately and how much together, so the saving reads without a calculator.

In the cart, the bundle discount appears as a separate line in the totals, rather than being “smeared” across item prices. This matters for trust: the shopper sees the same price they saw in the catalogue, plus an explicit “Bundle discount” line.

The gift, once the total reaches the threshold, is added to the cart automatically as a regular item, and its price is taken off by a separate line in the totals.

What the admin gets

A bundle is put together from existing catalogue items: you choose the composition, set the bundle price or a percentage discount. No separate “bundle products” are created — the catalogue doesn’t get cluttered.

For the gift you set a total threshold and the item itself. You can restrict a bundle by customer group, store or period, so a promotion ends on its own, without you being there on a Sunday evening.

Free version and Pro

Pro removes the limit on the number of bundles and gift rules.

Under the hood

The discount calculation lives in the same place where OpenCart calculates the rest of the totals, so it lands correctly in the order, in the customer email, and in exports — not just existing visually in the cart.

The module doesn’t create phantom products or change catalogue prices. Remove the module, and prices stay exactly as they were, with no database cleanup needed.

How to install

1. Upload the archive via “Extensions → Extension Installer” (in OpenCart 2.3 and 3.x — “Installer”).

2. “Extensions → Modules” → find “Product Bundles” and install it.

3. Create the first set: the main item, related items, the bundle price.

4. If you need a gift, set a total threshold and the gift item.

5. Check on a test order that the discount appears as a separate line in the totals.