How does Duplicup prevent overselling on bundles?

Duplicup coordinates inventory levels across all connected listings. When an order is placed, Shopify webhooks trigger Duplicup to decrement stock on sibling listings within seconds.

Do I need a separate heavy bundle app that changes my theme?

No. Most bundle apps force complex Liquid widgets and popup scripts onto your product page that slow down your store. Duplicup works 100% server-side via Shopify APIs with zero frontend code.

Shopify Multipack & Bundle Inventory Sync (Shared Pool)

The Trap of Manual Bundle Allocation

If you have 100 units of a product and want to offer both single bottles and 2-packs, dividing inventory manually (e.g. 60 singles, 20 2-packs) leads to missed sales when one sells out. Duplicup connects all listings to a single 100-unit pool so you never miss a sale or oversell.

How to Set Up Multipack Sync

Step 1: Create Your Single & Multipack Product Pages. Set up dedicated listings with unique volume discounts and ad copy.
Step 2: Link Listings in Duplicup. Use matching SKUs or Custom Link Groups.
Step 3: Automate Shared Real-Time Stock. Sales on any listing automatically update the pool in seconds.

Frequently Asked Questions

Do I need a separate theme widget?: No. Duplicup operates 100% server-side with zero theme or JavaScript code.
What happens when stock reaches zero?: All linked listings update to Sold Out automatically.