For shoppers
How bundle discounts apply
Bundle discounts apply automatically. No discount code needed.
#When does the discount appear?
The bundle widget on the product page shows an estimate of what you'll save. The actual discount is calculated when you check out, applied line by line to the items in your cart. You'll see the final discounted prices at checkout.
A savings banner may appear in the cart once your cart qualifies: "You're saving [amount] with [bundle name]."

#Free shipping
If the bundle includes free shipping, a "Free Shipping" badge appears in the widget and the shipping discount is applied automatically at checkout. You don't need to enter a code.
#How each bundle type earns its discount
Fixed set and similar: all required products must be in your cart at the required quantities. Remove one item and the discount no longer applies to the rest.
Buy X Get Y / Buy One Get One: the trigger (what you buy) must be in your cart. The reward (what you get discounted or free) is also added by the widget, so using the bundle's add-to-cart button is the easiest way to get it right.
Volume discount: the discount tier is based on the total quantity of that product in your cart when you check out. The widget shows a "Maximum discount applied!" message when you've reached the top tier.
Mix & Match: each group has its own minimum. You need to meet the minimum for every group before the discount applies. Meeting the total across groups is not enough if one group is short. The widget's progress indicator shows where each group stands.

#If the discount isn't showing at checkout
Several things can prevent the discount from applying:
Not all required items are in your cart. For a fixed set or Buy X Get Y, the complete set must be present at the right quantities. Go back to the product page and use the bundle's add-to-cart button to add everything at once.
Quantity is too low. Volume discounts require a minimum quantity to reach the first tier. For Mix & Match, each group has its own minimum. Check the bundle widget to see what's required.
A Mix & Match group is short. Meeting the total item count across all groups is not enough. Each individual group must hit its minimum. Check the progress indicator per group.
The bundle promotion has ended. Stores can run time-limited bundle offers. If the promotion has expired, the discount no longer applies even if the products are still in your cart.
If the saving was shown in the widget but didn't appear at checkout and none of the above apply, contact the store. They can check whether the offer is still active.
#Discount codes and bundle discounts
Bundle discounts and coupon codes may or may not stack, depending on the store's settings. If you want to use a coupon alongside a bundle offer, check the store's promotion terms or contact them before checking out.
See also: What are bundles?, FAQ