What Is a 3PL and When Should You Use One?

There’s a moment in every growing online store when the spare room fills with boxes, the kitchen table becomes a packing station, and you spend more time taping cartons than finding new customers. That’s usually when someone says, “Have you looked at a 3PL?”

A 3PL, or third-party logistics provider, takes over the physical side of ecommerce: storing your products, packing orders and handing them to carriers. Done right, it frees your time and can lower shipping costs. Done too early or with the wrong partner, it adds fees that eat your margin.

This guide explains what a 3PL does, how its fees work, and how to tell whether your store is ready.

What a 3PL does

A 3PL runs warehouses and the staff, software and carrier relationships needed to ship orders on your behalf. Shopify’s developer documentation describes a fulfillment service in the same terms: a third-party warehouse that prepares and ships orders for the store owner.

The typical flow looks like this:

1. You send inventory from your supplier or manufacturer to the 3PL’s warehouse.
2. The 3PL receives it, counts it, checks it and puts it on shelves, in bins or on pallets.
3. Your store sends orders to the 3PL automatically through an integration with platforms like Shopify, WooCommerce, Amazon or Walmart.
4. The 3PL picks and packs each order, buys postage and ships it.
5. Tracking flows back to your store so customers get shipping notifications.
6. Returns go back to the 3PL, which inspects and restocks them if you choose.

Many 3PLs also handle extra services like kitting (bundling items into sets), custom packaging, gift notes, B2B wholesale orders and freight.

Key takeaway: A 3PL turns fulfillment from a daily chore into a monthly invoice. It’s worth it when your time and growth are worth more than the extra per-order cost, not simply when you get busy for a week.

How 3PL fees work

3PL pricing is rarely a single number. Most providers quote custom pricing based on your order volume, product sizes and needs. ShipBob, for example, says all its quotes are customized for each customer. Rates vary widely between providers and regions, so treat any figure you see online as a starting point for comparison, not a budget.

Here are the fee types you’ll see on most quotes.

Amazon’s Multi-Channel Fulfillment, a related service, shows how per-unit fulfillment fees can rise in peak season. Amazon lists holiday peak fees for MCF from October 15, 2026, to January 14, 2027. Many 3PLs also adjust prices or storage rates around the holidays, so ask about peak surcharges before you sign.

The fees that surprise new sellers

• Receiving problems. If your supplier sends unlabeled or mixed cartons, the 3PL may bill extra labor to sort them.
• Storage creep. Slow sellers sit on shelves and cost you every month. Some providers charge more for stock held for long periods.
• Account minimums. A low per-order rate isn’t low if you can’t meet the monthly minimum.
• Dimensional weight. Carriers often charge by package size, not just weight, so oversized boxes cost more. Our guide to setting shipping rates explains how this works.

When a 3PL makes sense

There’s no single order count that tells you to switch. The right moment depends on your margins, products and how you value your time. These signs suggest you’re ready:

• Packing takes hours every day and stops you from marketing, sourcing or product development.
• You’re running out of space at home or in a small unit.
• Shipping costs are hurting conversion, and a 3PL’s negotiated carrier rates or multiple warehouse locations could lower them or speed up delivery.
• Your order volume is steady, not a short seasonal spike.
• You sell on several channels and need one inventory pool for your website and marketplaces.
• Errors and delays are rising as you pack more orders by hand.

When to keep fulfillment in-house

• Very low or irregular volume. Minimums and setup costs can outweigh savings.
• Highly custom or handmade products, made to order or personalized.
• Very fragile, very large or regulated items that many 3PLs won’t handle or charge a premium for.
• Thin margins where extra per-order fees would wipe out profit.

Doing it yourself can still be efficient with the right tools. See how to print shipping labels at home.

A simple way to run the numbers

Before you request quotes, work out what fulfillment costs you today. Include:

1. Postage per order at your current rates.
2. Packaging per order.
3. Your time per order, valued at what you’d pay someone else or what you could earn growing the business.
4. Space you rent or could use for something else.
5. Errors, such as reshipments and refunds from mispicks or damage.

Then ask each 3PL for an itemized quote based on your real data: monthly orders, average items per order, product dimensions, number of SKUs and expected inventory levels. Compare the total monthly cost, not just the per-order headline rate.

If a 3PL costs a bit more per order but gives you back many hours a week and faster delivery, it may still be the better deal.

3PL vs other fulfillment options

For Amazon-specific decisions, see Amazon FBA vs FBM. For supplier-shipped models, see how dropshipping works.

Hidden considerations: tax, control and data

Sales tax nexus. Storing inventory in a state can create a sales tax obligation there. If a 3PL spreads your stock across several warehouses, you may need to register in each of those states. Read our guide to sales tax nexus for online businesses and check with a tax professional. This is not legal or tax advice.

Customer experience. Your packaging is part of your brand. Ask whether the 3PL can use branded boxes, inserts or gift notes, and what it costs.

Inventory accuracy. Ask how often they cycle-count, how they handle discrepancies, and whether you can see live inventory.

Integrations. Make sure the 3PL connects to your store platform, marketplaces and any inventory or accounting tools you use. AI-driven forecasting and warehouse automation are spreading in logistics. See AI in logistics and supply chain for where it helps.

Where to start: choosing a 3PL in 6 steps

1. Gather your data: monthly orders, items per order, product sizes and weights, SKU count, and where your customers are.
2. List your must-haves: platform integrations, packaging needs, special handling, B2B or international shipping.
3. Request itemized quotes from 3–5 providers that serve businesses your size.
4. Ask about minimums, peak surcharges, contract length and exit terms. Find out how you get your inventory back if you leave.
5. Check references from sellers with similar products and volumes.
6. Start small. Send a portion of your inventory or 1 sales channel first, test accuracy and speed, then move the rest.

Conclusion

A 3PL is a fulfillment partner that stores, packs and ships for you in exchange for receiving, storage, pick-and-pack and shipping fees. It’s the right move when fulfillment is limiting your growth and your volume is steady enough to absorb the fees and minimums. Run the real numbers, compare itemized quotes and start with a trial. Once fulfillment is handled, you can focus on pricing smart offers like free shipping without losing money. Look up any unfamiliar terms in our glossary.

Sources

• ShipBob: Fulfillment pricing — fee categories (receiving, storage, pick-pack-ship, returns, B2B) and customized quote-based pricing
• Shopify developer docs: FulfillmentService object — definition of a third-party fulfillment service and how it connects to a store’s locations
• Amazon Multi-Channel Fulfillment — per-unit fees, 2026 holiday peak fee dates and default unbranded packaging