Set up products that require Hazmat labels to ship, so the correct label is generated when they're returned.
Where to find it
Settings > Returns > Shipping, under Return Shipping Settings.
[Screenshot: Shipping tab — Products requiring Hazmat Labels with Conditions panel]
What this is
Some products can't ship on an ordinary label. Conditions here identify which of your products need hazardous-materials labeling; Onward generates the appropriate Hazmat label when one is returned.
Products commonly classed as hazardous include:
Lithium batteries, and devices containing them
Aerosols — dry shampoo, sunscreen spray, deodorant
Flammable liquids, including many nail products and some fragrances
Certain cleaning products and solvents
Regulations vary by carrier and country. If you're unsure whether something in your catalog qualifies, check with your carrier — hazardous goods shipped on a standard label can be refused, delayed, or destroyed in transit.
If you need a Hazmat code that is not currently in the list, contact your Merchant Success Manager and we can add it for you.
Setting it up
Tag the relevant products in Shopify — something explicit like
hazmat.Click Conditions and add a rule matching that tag.
Save.
Matching on a Shopify tag rather than individual products means new products inherit the rule automatically.
Related settings
Preferred returns carrier — not every carrier handles Hazmat returns
Return eligibility — an alternative is making hazardous items non-returnable