Common Causes
Product not published to Online Store
Variant out of stock (not the product)
Multi-location inventory settings
Inventory tracking issues
Product removed from bundle collection
Check 1: Is the Product Published?
Products must be published to your Online Store sales channel to appear as available.
How to check:
Go to Products in Shopify admin
Find the product showing as sold out
Click to edit it
In the right sidebar, check Sales channels and apps
Make sure Online Store is checked
Click Save
Check 2: Is the Specific Variant in Stock?
A product can have some variants in stock and others sold out.
Example:
T-Shirt in Small: 10 in stock
T-Shirt in Medium: 0 in stock (sold out)
T-Shirt in Large: 5 in stock
If a customer selects Medium, it will show as sold out even though the product has inventory.
How to check:
Go to Products in Shopify admin
Click the product
Scroll to Variants
Check inventory for each variant
Check 3: Multi-Location Inventory
If you have multiple fulfillment locations (warehouses, stores), inventory is tracked per location.
The issue: By default, Shopify shows a product as "in stock" if there's inventory at ANY location. But if that location can't ship to the customer, they'll see an error at checkout.
The solution: Enable Fulfillable Inventory in Shopify settings.
Go to Settings → Shipping and delivery
Find "Manage fulfillable inventory" link
Enable Show only fulfillable inventory
Save
This makes products show as "Sold Out" when they're not available at locations that can ship to the customer.
See our full guide: Multi-Location Inventory
Check 4: Inventory Tracking Settings
Check how inventory is tracked for the product.
How to check:
Go to Products in Shopify admin
Click the product
Scroll to Inventory
Check the tracking settings
Possible issues:
"Don't track inventory" — Product should always show as available
"Track inventory" with 0 stock — Product is correctly showing sold out
Inventory policy — "Continue selling when out of stock" affects availability
Check 5: Product Still in Collection? (Pack Builder & Collection Bundles)
For Pack Builder and Collection Bundles, products must be in the specified collection.
For Pack Builder: Products must be in the collection you selected when creating the pack.
For Collection Bundles: Each step pulls from a specific collection. If a product is removed from that collection, it won't appear.
How to check:
Go to Products → Collections
Find the collection used by your bundle
Verify the product is still included
Check 6: Product Status
Make sure the product isn't:
Draft — Not visible to customers
Archived — Hidden from all channels
Deleted — Removed completely
How to check:
Go to Products in Shopify admin
Use the Status filter to check for draft/archived products
Change status to Active if needed
Check 7: Scheduled Products
If a product is scheduled to publish in the future, it won't appear as available yet.
How to check:
Go to Products in Shopify admin
Click the product
Look for a "Scheduled" status or publication date
Remove the schedule or wait for the publish date
Pack Builder Specific Issues
All items showing sold out
If every item in your Pack Builder shows sold out:
Check that the product collection still exists
Verify products are in the collection
Make sure products are published
Items disappear from pack
If products completely disappear (not just sold out):
The product may have been deleted
The product may have been removed from the collection
The variant may have been deleted
Still Showing Sold Out?
If you've verified:
Product is published
Product has inventory
Product is in the correct collection
All variants have stock
Try these steps:
Refresh the bundle product page (hard refresh: Ctrl+Shift+R or Cmd+Shift+R)
Clear browser cache or test in incognito mode
Wait a few minutes — Inventory syncs can take time
Contact support — Share the product and bundle details