Bundles change the economics of a session you already paid for. Acquisition cost is fixed the moment the shopper lands, and every unit after the first arrives without a second ad spend.

The simplest version raises units per order. Quantity breaks put three tiers under the Add to cart button, so a shopper who came for one bottle sees "2 for $38" and takes two.

Fixed bundles do the same work for inventory, pairing an item that sits with one that sells at a single price, while both product pages keep their normal prices. Mix-n-match extends that to higher tickets: the customer builds the set, and your hero product's headline price never moves, so comparison shoppers still see what they expected.

Product add-ons work earlier, sitting on the product page in front of a shopper who has not yet settled on how much to buy. Post-purchase offers work later, on the thank-you page after payment has cleared, where a decline leaves the original order untouched.

Snap Bundle runs all five as theme blocks priced by Shopify Functions and reports each one's views, add-to-carts, and AOV separately, so adoption stays a decision you revisit with numbers.