Short version — recommended approach

• Use Shopify’s free first‑party app Shopify Bundles for fixed bundles and multipacks. If you need mix‑and‑match bundles, use a third‑party bundle app from the Shopify App Store (or build with Bundles APIs if you’re on Shopify Plus). (help.shopify.com)

Step‑by‑step: create a fixed bundle or multipack with Shopify Bundles

1. Install Shopify Bundles (from Apps in your Shopify admin or the App Store). (help.shopify.com)
2. In Shopify admin, open Bundles → Create bundle. (help.shopify.com)
3. Enter a bundle Title and click Select products → choose the products and variants to include. (help.shopify.com)
4. Adjust quantities (for multipacks) or duplicate products to create multiple of the same item. Optionally add “quantity as an option” if you want customers to choose multiples. (help.shopify.com)
5. Save, add product details (images, description), set status to Active and choose sales channels to publish. (help.shopify.com)

Important behavior & considerations

• You must use a bundles app to properly sell bundles across Online Store, Shop and Shopify POS — creating a product manually without an app will not provide inventory syncing / bundle-specific features. (help.shopify.com)
• Discounts applied to a bundle are calculated on the parent bundle product first and then allocated to component products by weighted price (so tax and inventory math behave predictably). Keep this in mind when creating discounts or automatic promotions. (help.shopify.com)
• Mix‑and‑match bundles (where customers assemble their own bundle from interchangeable items) require a third‑party app from the Shopify App Store or custom development on Shopify Plus. (help.shopify.com)

Inventory, pricing & fulfillment tips

• Inventory syncing: prefer apps that sync child product inventory in real time to avoid overselling. If you create a simple bundle product without inventory-syncing, you’ll need manual inventory management. (Shopify’s docs recommend using a bundles app for accurate behavior.) (help.shopify.com)
• Pricing: you can set a bundle price in the bundle product, or use discounts/discount codes. Know how your chosen app handles discounts (Shopify Bundles uses allocation rules described above). (help.shopify.com)
• Fulfillment: decide whether you’ll ship bundle items together or separately. Configure fulfillment and shipping profiles accordingly so rates and packing are correct.

How to choose a third‑party bundle app (if you need mix‑and‑match or advanced features) Look for apps that offer:

• Real-time inventory sync for component products
• Mix‑and‑match or build‑your‑own bundle interfaces
• Cart/checkout compatibility (no broken checkout flows)
• Reporting and analytics for bundle sales
• Good mobile experience and POS support (if you sell in store) Shopify’s docs specifically point merchants to the App Store for mix‑and‑match solutions. (help.shopify.com)

Tracking & reporting

• Shopify Bundles includes bundle performance metrics (bundle sales, bundle orders, top sellers). You can also use Shopify Analytics/Reports to track bundled product performance. (help.shopify.com)

Quick checklist before publishing

• Products and variants for the bundle exist and have correct SKUs.
• Inventory tracking method chosen (app will sync child SKUs).
• Bundle price and/or discounts set and tested.
• Shipping and fulfillment configured.
• Test full purchase flow on desktop and mobile (and POS if needed).

If you’d like, tell me which type of bundle you want to sell (fixed, multipack, or mix‑and‑match) and whether you use POS or Shopify Plus — I can give a tailored checklist and recommend specific apps if you want.