As a growing e-commerce brand, navigating Amazon’s fulfilment options can feel like a minefield. From FBA to SFP to FBM, each route offers its own perks, pressures, and performance trade-offs. At 33 Fulfilment, we’ve lived through those decisions as brand owners ourselves — and now we help others make them smarter.

Here’s our breakdown of the three key Amazon fulfilment methods, how they impact your bottom line, and where a strategic 3PL like 33 Fulfilment can give you the edge.

FBA: Fulfilment by Amazon

What it is:

With FBA, you send your stock directly to Amazon’s fulfilment centres. They handle storage, picking, packing, Prime delivery, customer service, and returns.

Why brands choose it:

• Automatic Prime badge = stronger conversions.

• Seamless access to Amazon’s logistics and customer support.

• Scales effortlessly during peak periods.

What you need to watch for:

• Loss of control: Amazon owns the customer relationship.

• Unpredictable fees: Long-term storage, removals, and peak-season surcharges can eat away at margin.

• Prep requirements: Inventory must be packaged and labelled to Amazon’s spec — or you’ll be penalised.

33 Tip: FBA works well for fast-moving SKUs, but don’t assume it’s cheaper. We often help brands audit their FBA spend and uncover margin-eating inefficiencies.

SFP: Seller Fulfilled Prime

What it is:

SFP allows you to fulfil Amazon Prime orders directly from your warehouse (or 3PL partner) while still displaying the coveted Prime badge.

Why brands love it:

• You stay in control: Own your packaging, branding, and customer comms.

• Prime-level trust: You get the conversion boost of Prime without surrendering your stock to Amazon.

• Flexible returns and service: Keep it tailored to your business, not Amazon’s blanket policies.

What it takes:

• Strict SLA compliance: Same-day dispatch cutoffs, weekend shipping, and tight delivery targets.

• Approved carriers only: You’ll need access to Amazon Buy Shipping (and carriers like DPD, Royal Mail Tracked, etc.).

• Operational firepower: You must consistently meet Prime service standards.

33 Tip: We’re SFP-ready. As your fulfilment partner, 33 handles all the operational heavy-lifting — from shipping rule automation to same-day despatch — while you stay in full control.

FBM: Fulfilled by Merchant

What it is:

With FBM, you list your product on Amazon and handle everything yourself — storage, picking, packing, and shipping.

Why it works for some brands:

• Low fees: No FBA storage or fulfilment costs.

• Max control: You're in charge of the customer journey.

• Suited for: niche or low-volume products.

What to consider:

• No Prime badge = lower conversion rates.

• Operational complexity increases fast as you scale.

• Customer service & returns are 100% on you.

33 Tip: Many of our clients run hybrid models. They use FBM for slow movers or higher-margin SKUs, while FBA or SFP handles volume lines. We provide the fulfilment infrastructure that allows for that flexibility

Flexible Infrastructure Built for Amazon Sellers

There’s no one-size-fits-all answer when it comes to Amazon fulfilment — and the reality is, most successful brands don’t stick to just one model. Whether you’re using FBA for fast movers, SFP for your core range, or FBM for niche SKUs, what matters most is having a fulfilment partner that’s built to flex with your strategy.

At 33 Fulfilment, we don’t just advise — we execute. Our infrastructure is designed to support multi-channel brands selling across Amazon, Shopify, and beyond. From day-one SFP readiness with approved carriers and SLA-compliant operations, to seamless FBM integration through our WMS, we handle the operational complexity so you don’t have to.

We’re here to make it simple, scalable, and stress-free — whether you're shipping one product or ten thousand. Let’s grow your Amazon channel together.