Third-party logistics (3PL) means handing the storage, packing and dispatch of your products to an outside company. The 3PL holds your stock in its warehouse, receives orders from your online shop automatically, picks and packs them, and hands them to a courier.
How third-party logistics works
You send stock to the 3PL’s warehouse, usually in bulk from your supplier. The warehouse checks it in against your product codes and stores it. Your ecommerce platform is connected to the 3PL’s warehouse system, so each new order reaches the warehouse within minutes, is picked from the shelves, packed to your instructions and labelled for a carrier such as Royal Mail, Evri or DPD. Tracking numbers and updated stock levels flow back to your shop.
Most 3PLs also handle returns: receiving parcels, checking their condition, restocking or setting aside items, and updating your system so the refund can be issued. Some offer extras such as gift wrapping, inserts, kitting several items into a bundle, or storage in an EU warehouse for sellers who want to avoid customs delays on deliveries to Europe.
Pricing is usually built from several parts: receiving stock, storage per pallet or shelf per week, a pick-and-pack fee per order and per item, packaging, and postage. Compare quotes on your own order profile, not on the headline rate.
Why it matters
For a growing online shop, packing orders at home or in a small unit eventually becomes the bottleneck. A 3PL turns fulfilment into a variable cost and lets the business cope with peaks such as Black Friday and the run-up to Christmas without hiring and training temporary staff.
It also shapes your marketing more than people expect. The delivery promise in your ads, on product pages and in your Merchant Center shipping settings depends on the warehouse’s order cut-off times and the carrier services it uses. Advertise next-day delivery with a 1pm cut-off, and orders placed at 3pm arrive late, which your reviews will mention. Delivery charges and any free delivery threshold need setting with the 3PL’s real costs in view, or a popular offer can quietly erase the margin on small orders.
Common mistakes
- Choosing on storage price alone, then finding pick-and-pack and packaging fees make each order dearer than before.
- Moving to a 3PL just before peak season, with no time to fix integration problems.
- Not checking that stock levels sync back to the shop and the product feed often enough, so you sell items the warehouse does not have.
- Promising delivery times in ads and on the site that the warehouse cut-off cannot meet.
- Forgetting returns: no agreed process, no grading of returned items, no timescale for telling you a parcel has arrived.
- Signing a long contract without service levels for picking accuracy and dispatch times.
How to act on it
Before you approach any 3PL, gather a few months of data: orders per day on average and at peak, items per order, the size and weight of a typical parcel, the number of product lines and the returns volume. Ask each provider to quote on that profile and to explain their cut-off times, carrier options, integration with your platform and returns process.
Run a short trial, or move a slice of your range first. Once it is live, check that your delivery messages, Merchant Center shipping settings and checkout options match what the warehouse actually achieves.
Delivery speed and cost are part of your offer, so they belong in your marketing plan. I review them alongside pricing, channels and margins in my digital marketing strategy work for online retailers.