Two Shopify collections can contain many of the same products and still deserve separate pages. The problem starts when they serve the same buying need, target the same searches and give customers little reason to choose one over the other.
I check whether the overlap sends customers to a less useful page or leaves the business maintaining two collections that do the same job. Seeing two URLs against one keyword is a reason to investigate. It is not enough to justify deleting a page.
What collection cannibalisation looks like
Imagine a shop with collections called Running Jackets, Jackets for Running and Lightweight Running Jackets. The first two may be competing for essentially the same job. The third could serve a useful, narrower need, provided the range and content support it.
Product overlap alone does not settle the question. A waterproof running jacket can reasonably belong in both Running Jackets and Waterproof Jackets. Those pages help people shop in different ways.
The warning signs are closer than that: nearly identical ranges, interchangeable headings, similar copy and internal links that use the same wording for different destinations. If the pages have no clear distinction for a customer, I check whether both need to exist.
Start with Search Console
In Google Search Console, open the Search results performance report, select a relevant query and then view the Pages tab. This shows which URLs appeared for that search. Compare suitable periods and keep the country and device filters consistent.
Look at a group of closely related searches rather than one isolated phrase. Does the broad collection appear for general searches while a specialist collection attracts a narrower audience? That may be working perfectly well.
If similar pages repeatedly appear for the same buying intent, examine their combined clicks and the destination customers reach. Changes in the ranking URL are a clue, not proof that one page is suppressing another. Seasonality, availability and wider search changes can also affect the pattern.
Give each collection a clear purpose
I start with a short brief for every important collection: who it serves, what products belong there and which buying need it answers. This quickly exposes pages whose only distinction is a different arrangement of the same words.
For example, Running Jackets could cover the full range, Waterproof Running Jackets could address wet-weather protection, and Reflective Running Jackets could focus on visibility features. Each needs a suitable product selection and collection copy that supports the buying decision.
Simply replacing a few words in the description does not create a useful difference. The range, headings, links and supporting advice should agree about what the page is for.
Improve useful pages and consolidate redundant ones
Where both collections have a clear purpose, keep them and strengthen the distinction. Improve their product selection, explain relevant features and use specific internal-link wording. A broad collection can introduce narrower ranges without trying to cover every detail itself.
Where two pages genuinely duplicate the same job, choose the stronger destination using relevance, historical performance, links and ongoing commercial value. Bring across any useful information before retiring the redundant URL.
If you remove a collection permanently, use an appropriate permanent redirect to its closest equivalent and update the links you control. Check that the old address actually redirects. A planned redirect is not a completed fix.
Do not use canonicals to avoid the decision
A canonical tells Google which URL you prefer among duplicate or very similar pages. It is a signal, and Google can choose another URL. It is not a general instruction to make every related collection rank through one parent page.
For genuinely different collections, a blanket canonical can send a preference that conflicts with your intention to have both pages found. Decide whether the content should remain separate before choosing a technical treatment.
Measure the combined result
Record what changed and when. Then review clicks and impressions across the affected collections and relevant searches, alongside organic landing-page sales where your reporting allows it. Give Google time to revisit the pages and account for changes in stock or promotions.
My aim is a clearer collection structure that helps customers reach the right range. Better rankings are valuable when the resulting visits reach a page that can actually satisfy the search.
If your collections have grown without a clear plan, send me your store address and the ranges causing concern. My Shopify SEO work identifies what to keep, improve or consolidate, with a clear reason for each recommendation.