- Short answer
- Yes, per carrier: Shopify's FedEx page lists 6 × 4 × 0.5 in for US-location labels, and nine European carrier pages name their own (October 2026).
- FedEx scope
- Every FedEx label bought from a US location, not only One Rate.
- Europe
- Nine carrier pages: DHL Paket, Colissimo, Correos, Mondial Relay, Chronopost, Poste Italiane, DHL Express, DHL eCommerce Poland and PostNL.
- Envelope or soft pack
- Envelope: flat, no thicker than 3/4 in. A soft pack over 3/4 in loses USPS First Class Mail rates.
- Carriers that refuse them
- No flat packs: Mondial Relay, Chronopost, DPD. No envelope: Poste Italiane, DHL eCommerce Poland, Canada Post through Shopify.
- Below the minimum
- No page we read describes an error; price adjustments are documented (Canada Post international: missing rates may mean non-compliant packaging).
Who sets the minimum — Shopify or the carrier?
The carrier — but Shopify prints it on its own Help Center page for that carrier. The FedEx page, read October 28, 2026, says "Packages shipped with FedEx must have the following minimum dimensions": 6 in long, 4 in wide, 0.5 in high (15 × 10 × 1.2 cm).
That covers every FedEx service bought through Shopify Shipping from a US fulfillment location, not only FedEx One Rate. The ceiling works the same way: the maximum size and weight also depend on the carrier and service.
What minimum does each Shopify Shipping carrier page name?
Ten carrier pages, read October 28, 2026 — one US, nine European:
- FedEx, US location — 6 × 4 × 0.5 in (15 × 10 × 1.2 cm)
- DHL Paket, Germany domestic — 15 × 11 × 1 cm (6 × 4.4 × 0.4 in)
- Colissimo, France domestic — 16.1 × 11.1 × 1.1 cm (6.3 × 4.3 × 0.4 in)
- Mondial Relay, France domestic — 15.01 × 10.1 × 1.51 cm and 0.201 kg (0.44 lb)
- Chronopost, France domestic — 30.1 × 21.1 × 3.1 cm and 201 g (0.44 lb)
- Correos, mainland Spain domestic — a box over 10.1 × 15.1 × 1.1 cm
- Poste Italiane (Poste Delivery Business Express and Standard), Italy — height of at least 1 cm (0.39 in)
- DHL Express, five European origins — 10 × 15 × 1 cm (3.9 × 5.9 × 0.4 in)
- DHL eCommerce Poland (domestic and other EU) — 15 × 11 × 1 cm (5.9 × 4.3 × 0.4 in)
- PostNL, Netherlands domestic — longest side 10 cm, shortest 1 cm, 1 g (0.04 oz)
On the German page, DHL Kleinpaket has its own, smaller minimum — read the row for the service you buy.
What if your item is smaller than the minimum?
Put it in a box that meets the carrier's minimum. Shopify's packaging page separately defines two flat package types: an envelope, "A large, flat envelope no thicker than 3/4 inches." and a soft pack, a padded mailer or sleeve, which loses USPS First Class Mail rates above 3/4 in. Neither definition says a flat pack is exempt from a carrier's minimum.
Not every carrier takes flat packs: Mondial Relay and Chronopost take boxes only, DPD takes neither envelopes nor soft packs, Poste Italiane and DHL eCommerce Poland take a soft pack but no envelope, and Canada Post through Shopify takes no envelope.
No Shopify page we read on October 28, 2026 — the ten carrier pages above plus the packaging, label-buying, rates and billing pages — describes an error for a parcel under the minimum. They document a price adjustment when the carrier measures a different size than you declared, and the packaging page notes that missing Canada Post international rates at fulfilment might mean your packaging doesn't meet Canada Post's requirements.
An unavailable label button has other causes — see why you can't buy a shipping label on Shopify.
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