First decide which items are counted and what is measured. A maximum of three items has different results when it applies to the whole order, a collection, each product, or each variant.
Choose by calculation scope
| Your goal | Rule type | How it is evaluated |
|---|---|---|
| Limit an order's quantity, value, or weight | Order limit | Adds up the cart items in the rule's scope |
| Limit items in selected collections together | Collection limit | Adds up matching collection items |
| Limit products individually or as a group | Product limit | Uses the per-product, per-variant, or combined setting |
| Limit one specific product option | Variant limit | Evaluates the targeted variant |
| Cap units sold across customers and orders | Total limit | Tracks sold, reserved, and available quantity |
| Decide who can buy selected products | Product access rule | Evaluates blacklist or whitelist conditions |
| Control how items can be bought together | Purchase combination | Choose one, shared limit, or buy together |
Choose the measurement
Order, collection, product, and variant limits support quantity, value, or weight, with applicable minimum or maximum thresholds. Total limits cap cumulative quantity across orders. Product access rules answer whether a purchase is allowed; they do not use a standard quantity threshold.
Two examples that are easy to confuse
Example 1: No more than three items from Collection A in total. Choose a collection limit. If the cart has two units of Product X and two units of Product Y from that collection, the combined four units exceed the cap.
Example 2: No more than three units of each product in Collection A. Choose a product limit scoped to the collection with per-product evaluation. Two units each of X and Y stay below the cap for both products.
Next: Set order limits or Set product limits.
Use a test product or cart to check the outcome before applying this setup across your store.
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