How to Choose a 3PL: A Checklist for Amazon Sellers | Inventory Hero
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How to Choose a 3PL: A Checklist for Amazon Sellers
How to choose a 3PL for your Amazon business: the criteria that matter, from FBA experience and integration to pricing transparency, services, and minimums.
Prioritize FBA and Amazon experience, location relative to your customers and to FBA inbound, integration with your systems, transparent and complete pricing, and the specific services you need (prep, kitting, returns, multi-channel). Then check minimums, communication quality, and references. The best 3PL is the one that fits your channel mix and catalog, not the cheapest quote.
How do I compare 3PL quotes?
Compare total cost for your actual usage, not headline storage rates. Ask each provider to price a realistic month of your volume across every fee: receiving, storage, pick-and-pack, kitting, shipping, returns, and any account or minimum fees. A low storage rate can hide high pick fees or minimums, so the only fair comparison is the all-in cost for how you would actually use them.
Andrew Erickson is the founder of Inventory Hero. He has spent years working with Amazon FBA sellers on demand forecasting, restock planning, and the cash flow side of running a private-label brand. Inventory Hero exists because every spreadsheet-based inventory system he tried eventually broke — usually right before Q4.
Yes. Move a portion of your inventory or a single channel first, and run it for a few weeks before shifting your whole catalog. A trial reveals a 3PL's real receiving speed, accuracy, and communication under a live workload, which references and sales calls cannot. Switching 3PLs later is disruptive, so the trial is cheap insurance on a big decision.
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Choosing a 3PL is a fit decision, not a price decision: the provider that matches your channels, catalog, and service needs will save you far more than the one with the lowest headline rate. The short version: weigh FBA experience, location, integration, transparent pricing, and the services you actually need, then verify minimums, communication, and references, and run a small trial before you move everything. Below is the checklist.
Start with the factors that make or break the relationship:
FBA and Amazon experience. A 3PL that regularly preps and ships FBA inbound knows Amazon's FNSKU labeling, carton, and routing rules, which prevents the receiving problems that strand inventory. This is non-negotiable for an FBA-centric seller.
Location. Proximity to your customers affects shipping cost and speed for your own-channel orders, and proximity to FBA inbound affects how cheaply you can feed Amazon. Match the location to where your inventory needs to go.
Integration and technology. The 3PL should connect to your systems so orders and inventory sync automatically. A provider that requires manual spreadsheets will not scale with you.
Transparent pricing. You want every fee listed up front, not a low storage rate with surprises later. See 3PL costs for the full fee structure to ask about.
The services you actually need. Prep, kitting, bundling, returns, multi-channel fulfillment: pay for what you use. A provider strong in areas you do not need is not a better fit.
Once a provider looks like a fit, verify the things that only show up in practice:
Minimums. Monthly minimums, minimum storage, or minimum order volumes can make a "cheap" 3PL expensive at your scale. Confirm them.
Communication. How fast and clearly they respond during sales is a preview of support when a shipment goes wrong. Slow or vague now means slow or vague later.
References. Ask for references from sellers with a similar catalog and channel mix, and actually call them about reliability and billing surprises.
Contract terms. Understand the commitment, notice periods, and what happens to your inventory if you leave.
These checks are quick and catch the providers that look good on paper but fail in operation.
The right provider depends on what you are actually doing:
Mostly FBA with overflow? You need strong FBA-inbound experience and cheap, reliable feeding into Amazon; multi-channel bells and whistles matter less. For pure FBA-bound bulk, also weigh AWD.
True multi-channel? Prioritize a provider that fulfills your website and other marketplaces well, with solid order integration across all of them.
Custom prep or kitting? Confirm the provider does your specific work reliably, not just "we can do that" on a sales call. If your need is mainly FBA prep, a prep center may fit better than a full 3PL.
Choosing for your real workload, rather than a generic "best 3PL," is what gets you a provider that fits.
Take the same list to every 3PL so you can compare like for like:
What is your full fee schedule, including receiving, storage, pick-and-pack, returns, and any minimums or setup fees?
How much FBA inbound do you do, and how do you handle Amazon's labeling and routing requirements?
What does your integration with my systems look like, and how real-time is the inventory sync?
What is your receiving turnaround, and your on-time ship rate?
Can I speak to two references with a catalog like mine?
What are the contract term, notice period, and exit process for my inventory?
Grade the answers against rough benchmarks: receiving turnaround under 24 to 48 hours is what you want and 3 to 5 business days is a warning sign; a 98 percent-plus on-time ship rate is healthy; and real FBA experience shows up as a provider who can name Amazon's carton, labeling, and routing rules without hesitating. A few red flags: a quote that leads with only a storage rate and gets vague on the rest, no real FBA experience, no system integration, and evasiveness on minimums or references. Any one is a reason to keep looking.
If you do not have a shortlist yet, sellers usually source 3PLs through referrals from other sellers, industry Facebook and Slack groups, freight-forwarder networks, and Amazon's own partner directory. A warm referral from a seller with a similar catalog and channel mix is the best starting point, because they have already stress-tested the provider you are considering.
When the quotes come back, price them, do not eyeball them. As an illustration: Provider A quotes 0.65 dollars a unit in storage and 3.50 a pick; Provider B quotes 0.95 storage and 2.80 a pick. On a high-order month, B's lower pick fee more than offsets its higher storage, so it wins despite the worse headline rate a seller would fixate on. Run your own volume through both, exactly as the 3PL costs comparison lays out, and let the all-in total decide.
Choosing a 3PL is about fit: FBA experience, location, integration, transparent pricing, and the services you need, verified with minimums, communication, and references, and de-risked with a trial. The lowest quote that fails on reliability or hides fees is the expensive choice. Match the provider to your channel mix and catalog, and see 3PL costs and when to use a 3PL to complete the decision. For the wider system, see restock planning.