A single-product subscription is easy to start and easy to cancel. When the customer has had enough of that one thing, there's nothing else holding them. Bundles change that. They introduce subscribers to more of your catalog, raise the size of each order, and make the subscription feel like theirs, especially when they choose what goes in.
This guide covers the three main bundle types, when each one fits, how to price them, how to handle stock and swaps, and what to measure. If you're specifically planning a customer-built box, our build-a-box guide goes deeper on that one model.
The three bundle types
| Type | Who chooses the products | Works best for | Example |
|---|---|---|---|
| Fixed bundle | You | Starter kits, routines, best sellers | A cleanser, serum and moisturizer sold together |
| Mix-and-match | The customer, from a set list | Products with many flavors, scents or sizes | Any 3 candles from the fall collection |
| Build-a-box | The customer, item by item, up to a set size or price | Snacks, coffee, pet treats, beauty samples | A 12-bar box, chosen flavor by flavor each month |
Fixed bundles: simple, fast and easy to sell
A fixed bundle is a set group of products at one price. It's the easiest to explain, the easiest to pack and the best way to get a new customer started with the right combination.
- Starter kits: The products a new customer needs on day one, often with a refill-only subscription after the first order.
- Routines: Morning and night skincare, a cleaning set or a training stack, sold as one thing to subscribe to.
- Best-seller bundles: Your top products together, which shortens the decision for new customers.
- Pair new with popular: Put a new or slow-moving product next to a best seller so more customers try it.
A useful pattern is starter to refill: the first order ships the full kit (with the bottle, the dispenser or the case), and every order after ships only the refills. That needs a way to change what ships after the first order. In Chargezen that's a workflow that swaps the product or plan after the first order.
Mix-and-match: choice without complexity
Mix-and-match lets customers pick a set number of items from a list you control, such as "any 3" or "any 6", at a bundle price. It suits catalogs with lots of variants where a fixed bundle would always include something the customer doesn't want.
- Keep the list focused: Ten to twenty choices is plenty. A list of 80 slows the decision and makes stock harder to plan.
- Show a recommended set: Pre-fill a popular combination so customers who don't want to choose can check out right away.
- Allow repeats: Let customers pick the same flavor twice. Some people only want their favorite.
Build-a-box: the subscription customers design
Build-a-box takes mix-and-match further. The customer fills a box item by item up to a set size or price, and on a subscription can usually change the contents before each order. It's the bundle type most tied to retention, because a box the customer designed is harder to walk away from than one you chose for them.
- Fixed size or fixed price: A box of 12 items at one price is easiest to understand. A box with a minimum spend works when item prices vary a lot.
- Rotating picks: Ask subscribers to choose new items before each order, and set a fallback if they don't, such as last month's box or your picks.
- A curated first box: Start new subscribers with your picks, then let them customize later. This speeds up the first checkout.
- Mix across categories: Let customers combine product lines, such as snacks and drinks, to build a personal routine.
See build-a-box in detail and the setup in the build-a-box docs.
How to price a bundle
There are three common ways to price a bundle. Most brands pick one per bundle and stick with it so customers learn what to expect.
| Pricing | How it works | Use it when |
|---|---|---|
| Fixed price | One price for the whole bundle, whatever is inside | Items cost about the same, or you want a clean price such as $49 |
| Dynamic price | The price adds up the items chosen, often with a discount off the total | Item prices vary a lot, as in a build-a-box with premium items |
| Tiered | The discount grows with bundle size: 10% off 3 items, 15% off 6, 20% off 12 | You want to reward bigger boxes |
- Check the most expensive combination: With a fixed price, a customer can fill the box with your highest-cost items. Make sure that box still earns money.
- Decide how bundle and subscription discounts combine: If a bundle is 15% off and subscribe and save is 10% off, decide whether a subscribed bundle gets 15%, 25% or something in between, and show the final price.
- Show what the customer saves: Show the bundle price next to the price of the items bought separately.
- Show the next tier: With tiered pricing, "Add 1 more to save 15%" next to the box is often all the nudge customers need.
Stock, swaps and substitutions
Bundles make stock planning harder, because one order draws on several products. Subscriptions make it predictable again, because you know roughly what ships next month. Plan for the gaps:
- Hide items that are out of stock: Don't let customers pick something you can't ship. Hide it from the builder until it's back.
- Set fallback contents: If a subscriber's chosen item runs out before their order, decide what ships instead: a similar item, your pick, or the order waits. Tell them which.
- Let subscribers swap: A subscriber who can change an item or a quantity from the portal is less likely to cancel over one flavor they're tired of. See product swap.
- Forecast from upcoming orders: Upcoming subscription orders tell you what you'll need. Order stock from them, not just from last month's sales.
- Keep fulfillment clear: Make sure the warehouse sees each item in the bundle, not just a bundle name, so every box is packed correctly.
Bundles in the customer portal
A bundle subscription is only as good as the subscriber's ability to change it. In the portal, bundle subscribers should be able to:
- Change the items in their next box, and the quantities.
- Skip a box or send the next one now.
- Change how often the box ships.
- Add one-time items to the next box.
- See what will ship and when, before they're charged.
See the Chargezen customer portal for how this works.
Which bundle should you start with?
- New customers need guidance: Start with a fixed starter kit, then refills.
- Lots of flavors or scents: Mix-and-match, with a recommended set pre-filled.
- Subscribers get bored: Build-a-box with rotating picks, or a curated box that changes each month.
- Order size is low: Tiered pricing on any bundle, so bigger boxes save more.
- Launching new products: Put them in a fixed bundle with a best seller, or in the mystery box.
What to measure
- Order size: the average bundle order compared with single-product orders.
- Retention: how many bundle subscribers reach a third and sixth order, compared with single-product subscribers.
- Margin per box: after discounts and shipping, including the most expensive combinations customers actually choose.
- Swap and skip rates: frequent swaps away from one item are a sign to replace it; frequent skips can mean the box is too big.
- Fallback rate: how often orders ship with a substitute because something ran out.
Frequently asked questions
What is a product bundle?
A group of products sold together, usually at a better price than buying each one. It can be chosen by you (a fixed bundle) or by the customer (mix-and-match or build-a-box). See product bundles.
Can bundles be one-time purchases and subscriptions?
Yes. Most brands sell the same bundle both ways, with an extra saving for subscribing.
What is the difference between mix-and-match and build-a-box?
Mix-and-match is a set number of picks from a list at a bundle price. Build-a-box usually means a box the customer fills item by item, often with a size or price target, and on a subscription can change before each order.
Do bundles reduce cancellations?
They can, because customers who discover more of your catalog have more reasons to stay, and a box they chose themselves fits them better. Measure it: compare bundle and single-product subscribers over the same months.
How Chargezen helps
Chargezen is the revenue platform brands run on. For bundles, Chargezen Subscriptions and CheckoutOS cover:
- Every bundle type: Fixed bundles, mix-and-match, build-a-box and monthly box clubs, sold one-time or on subscription. Subscription bundles.
- Pricing: Fixed, dynamic or tiered pricing that grows with bundle size. Setup in mix-and-match bundles.
- Stock: Hide out-of-stock items and set fallback contents, so orders keep moving.
- Subscriber changes: Change items and quantities, skip or send now from the customer portal.
- Starter to refill: Workflows that change the plan or swap the product after the first order.
- More ways to sell: Bundle offers at checkout and after purchase with CheckoutOS, and prepaid bundle plans.
Subscriptions is $199 a month or $1,990 a year for Shopify Advanced and Shopify Plus stores, with no commission. CheckoutOS is $99 a month. See pricing.
Keep reading: Grow a custom box subscription with build-a-box, How to turn one-time buyers into subscribers and Which subscription plans should you offer? Terms used here: product bundles, build-a-box subscription and tiered discounts.
