7 E-commerce Fulfilment Mistakes That Are Costing You Customers

Fulfilment is the part of e-commerce that nobody sees until something goes wrong. And when it goes wrong, your customers feel it immediately. I've managed fulfilment in-house, through 3PLs, and via Amazon FBA, and these are the mistakes I see again and again.

Mistake 1: No proper SKU system

If your SKUs are a random mix of supplier codes, colour abbreviations, and numbers you made up at 2am, your error rate will reflect that. A good SKU system is human-readable and logical:

CNDL-LAV-200G tells your warehouse team exactly what to pick: candle, lavender, 200g.

X7829B tells them nothing.

Invest an afternoon in standardising your SKUs. It prevents mis-picks, makes inventory counts faster, and helps you better analyse what's selling.

Mistake 2: No quality control on packing

"Ship and hope" isn't a QC strategy. Every order should have a basic check before it goes in the box:

• Right product(s)?
• Right quantity?
• No damage?
• Marketing inserts included?

This takes 10-15 seconds per order and saves you the £8-12 cost of reshipping, plus the customer relationship damage. If you're using a 3PL, ask about their QC process. If they don't have one, that's a problem.

Mistake 3: Ignoring packaging as a brand touchpoint

Your packaging is the only physical interaction most DTC customers have with your brand. A plain brown box with a packing slip tells them you don't care about the experience.

You don't need a £3 custom box. A branded tissue paper, a small thank-you card, or even a well-designed packing slip with a personal note goes a long way. The unboxing is a marketing moment, so treat it like one.

Mistake 4: Manual inventory tracking

If you're tracking stock in a spreadsheet that gets updated "when someone remembers," you will sell products you don't have. It's not a matter of if, it's when.

Your Shopify inventory should be your single source of truth, synced with your warehouse (or 3PL) in real time. If there's a lag, orders will go out for items that are already sold. Set up low-stock alerts so you're reordering proactively, not reactively.

Mistake 5: One shipping option

Offering only standard delivery is leaving money on the table. Different customers have different needs:

• Standard (3-5 days): Your base option.
• Express (1-2 days): Premium customers will happily pay extra. This can be a profit centre.
• Free shipping threshold: "Free delivery over £40" increases AOV reliably. Set the threshold just above your current average order value.

Test your shipping options. I've seen stores increase AOV by 15-20% just by introducing a well-placed free shipping threshold.

Mistake 6: Not tracking fulfilment metrics

What gets measured gets managed. Track these monthly at minimum:

• Order accuracy rate (target: 99.5%+)
• Average time from order to dispatch (target: same day or next day)
• Shipping damage rate (target: under 1%)
• Customer complaint rate related to fulfilment
• Return rate and reasons

If you're using a 3PL, hold them accountable to these metrics. Put them in the contract.

Mistake 7: No returns process

Returns are inevitable in e-commerce. Having no clear process means your team improvises every time, which means inconsistent customer experience and stock that sits in a "returns" pile for weeks.

Build a simple returns workflow:

1. Customer requests return (via email or a self-serve portal, as tools like Loop Returns integrate beautifully with Shopify)
2. Return authorised or denied based on clear criteria
3. Customer ships back with a prepaid label (your call whether you absorb this cost)
4. Item received, inspected, graded
5. Refund or exchange processed within 48 hours
6. Item restocked (if suitable) or written off

Document it, train your team on it, and communicate it clearly to customers. A smooth returns experience is genuinely a competitive advantage, because people buy more confidently when they know returns are easy.