How to Offer Bundle Discounts Without a Fixed size Mix and Match in Shopify

Last updated: 27 October 2026

An open-ended quantity offer gives a shopper a reward at a quantity you choose without forcing them to buy an exact pack size. They add any number of items, always reach checkout, and the best offer they have earned is applied automatically. In PushBundle (a Shopify app by WhenLab) you set this by switching off Fixed pack size on a Mix & Match bundle.

Key takeaways

• Each offer unlocks a discount, a free gift or free shipping at a quantity you set.
• There is no upper limit, so a shopper can add three or thirty.
• Shoppers can always reach checkout whatever quantity they picked, rather than being blocked until they hit a pack size.
• It works the same way on Single Product and Multi Product Mix & Match bundles, on the Growth plan ($14/month as of October 2026).

What is an open-ended quantity offer?

A fixed pack bundle says "choose exactly six". An open-ended one says "choose what you like, and at six you get 10% off, at twelve you get 15%, at twenty-four shipping is free".

The difference that matters commercially is what happens to the shopper who wants seven. A fixed pack either blocks them or makes them buy eight. An open-ended offer takes the order at seven, applies the six-item discount, and shows them how close the next tier is.

How do I set up quantity offers in PushBundle?

1. Open PushBundle in your Shopify admin and create or edit a Mix & Match bundle.
2. Add your products. A multi-product bundle can hold up to 128.
3. Switch off Fixed pack size.
4. Add a quantity offer: the quantity, and what it unlocks (a percentage or fixed discount, a free gift, or free shipping).
5. Add as many more as you want. A common ladder is 6, 12 and 24.
6. Check the live preview, then save and publish.

The discount setup is covered in How to add a discount to a Mix & Match bundle.

When should I use a fixed pack instead?

Use a fixed pack when the pack is physically the product. A six-bottle wine case ships in a six-bottle box. A twelve-pack of beer is a twelve-pack. If your packaging, shipping rates or fulfilment process assume a specific count, a fixed pack keeps your operation honest and prevents an order you cannot pack.

Use open-ended offers for refills, pick-and-mix confectionery, cosmetics samples, pet food, coffee beans, or anything you ship in a box sized to the order. They also suit stores testing where the discount thresholds should sit, because you can watch what quantities shoppers actually choose rather than only what your packs allowed.

Fixed pack vs open-ended quantity offers

FAQ

Is there a maximum quantity?
No. Open-ended offers have no upper limit.

What does the shopper get if they land between two offers?
The offer they have earned, meaning the highest threshold they have passed, applied automatically.

Can an offer be a free gift or free shipping rather than a discount?
Yes. Each offer can unlock a percentage or fixed discount, a free gift, or free shipping.

Does it work on both Mix & Match types?
Yes, Single Product and Multi Product bundles behave the same way.

Will my existing bundles change?
No. Existing bundles keep their fixed pack size until you switch it off.

Which plan do I need?
Mix & Match bundles are on the Growth plan, $14/month as of October 2026. The free Starter plan covers Volume bundles with quantity tiers.

Can I still show the shopper how close the next offer is?
Yes. The pack layouts show a progress bar towards the next threshold as the shopper adds items.

Does this work in Shopify POS?
Bundles sell in Shopify POS, but open-ended quantity offers are not priced on POS yet. Use a fixed pack or a Volume bundle for in-person sales for now.

Where to go next

5 Shopify volume bundle problems and how to fix them covers the tier mistakes that cost the most, and How to run Shopify mix and match promotions covers timing them around a sale.

Try PushBundle on your store and set your first quantity ladder.