3PL

Why it matters

Moving to a 3PL converts a fixed cost into a variable one. Instead of a lease, staff, and equipment that cost the same in January as in November, fulfilment becomes a per-order charge that scales with volume. For a growing brand, that is often the difference between funding inventory and funding a warehouse.

The second gain is geographic. A 3PL with several facilities can hold stock near the customers, which shortens delivery times without the brand operating anything. Delivery speed is a conversion factor on the product page, so this is a storefront improvement bought through logistics.

What is given up is control and visibility. Someone else now packs the parcel, handles the mis-pick, and decides how the unboxing feels. Brands for whom packaging is part of the product feel that loss more than others.

How it works on Shopify

The integration is the part that determines whether the arrangement works. Shopify sends orders to the 3PL, the 3PL reports fulfilment and tracking back, and inventory counts sync in the other direction. Each leg can fail quietly.

Inventory is the leg that hurts. If stock levels sync on a delay or only partially, the storefront sells items that are not there, and every oversell is a refund and an apology. Sync frequency and direction should be established before signing, not discovered in the first busy week.

Webhooks are how the 3PL should learn about orders — immediately, rather than by polling — and the integration must handle duplicate deliveries, because webhooks are delivered at least once.

Multi-location inventory in Shopify is what makes a 3PL work alongside a shop or a second warehouse. Stock is tracked per location and orders are routed accordingly, which is also what enables split shipments.

SKU discipline is the prerequisite. The 3PL joins on that field, and duplicates or blanks make onboarding a mapping exercise.

Common mistakes

• Choosing on rate card alone. Per-pick pricing is easy to compare. Integration quality is not, and it costs more when it is bad.
• No inventory reconciliation. Systems drift. Without scheduled counts, the storefront's stock figure is a guess.
• Ignoring returns. Returns handling is frequently a separate, worse-specified part of the contract, and it is where customer experience is lost.
• One warehouse, national promises. A single location cannot support two-day delivery across a large country, whatever the storefront says.
• No SLA on error rates. Mis-picks and late dispatch happen. What matters is the agreed threshold and what follows when it is breached.
• Migrating stock without a freeze. Inventory moving between facilities while the store is selling produces a week of exceptions.

When you need help

The integration audit is the useful work — before signing, and again if oversells start. Confirming how inventory syncs, in which direction, how often, and what happens when a webhook fails is what separates a 3PL relationship that runs quietly from one that generates daily exceptions.

The other case is the migration itself: moving stock into a 3PL while continuing to trade, with a cutover plan that does not sell items in transit. That is a project with a date, not a settings change.