Mixed Cart Limits
Keep incompatible products out of the same cart
Some products should not be purchased together. Mixed cart limits block incompatible combinations at checkout automatically.
Features
How it works
Define Product Groups
Select which products cannot be purchased together using tags, collections, or manual selection.
Checkout Validation
When customers try to checkout with incompatible items, they see a clear message explaining the restriction.
Custom Messaging
Write your own error messages so customers understand why items cannot be combined.
Works with All Themes
No theme modifications. Mixed cart limits work through Shopify checkout functions.
Use Cases
Common use cases
Food merchants keeping cold chain items separate from standard shipping.
Products from different locations require separate orders.
Batteries, liquids, or restricted items that must ship alone.
Keep digital downloads separate from physical goods.
Different billing cycles require separate purchases.
Custom items with longer lead times purchased separately.
How It Works
Block or require product combinations
Simple trigger-target logic
Define your incompatible combinations once. The app enforces them automatically at every checkout.Define trigger products
Select which products activate the rule. When these items are in the cart, the rule kicks in.
Set target products
Choose what products get blocked, limited, or required when triggers are present.
Choose your rule type
Block target products entirely, limit them to a maximum quantity, or require them to be present.
Reviews
What merchants say
" We ship frozen meals and pantry items from different facilities. Before this, customers would order both and complain about split shipments. Now the checkout explains why they need separate orders. "
Lisa
Meal Kit Company Owner
" Selling batteries alongside regular products was a nightmare for shipping compliance. Now customers see a clear message about hazmat shipping requirements and place separate orders. "
Mike
Electronics Retailer
FAQs
Frequently Asked Questions
What happens when a customer tries to mix incompatible products?
Checkout is blocked and the customer sees a clear error message explaining why these items cannot be purchased together. You can customize this message to guide them on how to complete their order.
Can I require certain products to be purchased together?
Yes. Mixed cart limits work both ways: you can block incompatible combinations and also require certain products to be in the cart together. For example, require a main product before allowing add-ons.
How do I define which products cannot be mixed?
You can define product groups using Shopify tags, specific product IDs, or variant IDs. Tag-based rules are the most flexible: tag products as "frozen" and "ambient" then block those tags from appearing together.
Does this work with my existing shipping setup?
Yes. Mixed cart limits run at checkout before shipping is calculated. They prevent the mixed cart from being submitted in the first place, so your shipping logic never has to handle incompatible combinations.
Can I set different rules for different customer groups?
Yes. You can apply mixed cart rules to specific customer tags or segments. For example, wholesale customers might be allowed to mix products that retail customers cannot.
Learn More
Related guides and tutorials
Complete guide to setting up mixed cart rules for shipping and fulfillment.
Learn about all the limit types available including quantity, price, and mixed cart.
Stop mixed carts today
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