How to Build a Supply Chain That Does Not Break: Lessons from Managing 300+ Brands

Your supply chain will make or break your e-commerce business. That is not an exaggeration. How to build a supply chain that does not break is a question I answer almost every week at Marknology, because inventory management is the thing that kills more promising brands than bad marketing ever will. Learn more in our Amazon FBA fulfillment guide.

After managing 300+ brands on Amazon and across multiple marketplaces, I have seen every supply chain disaster imaginable. Products lost in transit. Warehouses labeling items incorrectly. Shipments going to the wrong fulfillment centers. Every one of these mistakes costs real money. Here is how to prevent them. Learn more in our third-party logistics services.

The First Three Commandments: Inventory, Inventory, Inventory

If I had a ten commandments of selling on Amazon, the first three would be inventory. I have said this more times than I can count, and I will keep saying it because brands keep making the same mistake: they invest in marketing while their inventory management is a mess.

If I had a ten commandments of selling on Amazon, the first three are inventory. Inventory. Inventory., Andrew Morgans

You cannot advertise your way out of a stockout. You cannot optimize a listing that has zero units available. Inventory is the foundation everything else sits on.

What the Pandemic Taught Us About Redundancy

The pandemic was the ultimate supply chain stress test. Brands that relied exclusively on FBA got crushed when Amazon restricted inbound shipments to essential goods only. The brands that survived and thrived were the ones with backup fulfillment.

At Marknology, one strategy we always push is having a backup to FBA. Whether that is a 3PL, an internal warehouse, or what we call Fulfillment by Marknology (FBM, a play on the Amazon acronym), the point is simple: never be one decision away from losing your ability to sell.

We set up our own 3PL specifically because after nine years of dealing with different fulfillment partners across the country, I got tired of the inconsistency. Some 3PLs are digitally first and integrate beautifully with Amazon. Others cannot even connect to an API. When your Amazon business is doing millions in revenue, that inconsistency is not a minor inconvenience. It is an existential risk.

FBA Mistakes That Cost Real Money

FBA is the best fulfillment system in e-commerce. It is also unforgiving when you make mistakes. Here are the ones I see most often:

• Sending products under the wrong ASIN. I once made a $15,000 mistake sending vitamin K2 products under a vitamin K2+D3 listing. Everything got mixed up, had to be pulled back, resorted, and relabeled. It came out of my paycheck.
• Skipping proper prep. Glass items need different prep than poly bags. Products that might leak need isolation packaging. Amazon will commingle your product with others if you do not specify otherwise. Put the right stickers on. Take the time to do it right.
• Not reconciling inbound shipments. You sent 120 units but Amazon only received 98. If you are not tracking that gap, you are bleeding money through what I call death by a thousand cuts.
• Ignoring refund reconciliation. We use a partner called Getida that audits Amazon accounts for missed refunds. For some sellers, it recovers $20,000-30,000 per year that would have otherwise disappeared.

The Multi-Warehouse Strategy

The move happening in 2026 is getting off the coast and into the Midwest. Brands are realizing that shipping everything from LA means higher costs and longer transit times to 60% of the US population.

Amazon's inventory placement service lets you send everything to one warehouse, and then their system distributes it based on customer demand. But if you are running your own fulfillment as a backup, think about geographic distribution. A warehouse in Kansas City can reach most of the US within two days by ground. That is a meaningful competitive advantage.

The Tech Stack That Keeps Everything Moving

Your inventory management system needs to handle:

• Multi-channel inventory sync (Amazon, Shopify, Walmart, Etsy, and more)
• Purchase order tracking from manufacturer to warehouse to Amazon
• Automated reorder alerts based on sell-through rates
• Accounting integration so your finance team can see real-time COGS

If your system cannot do these things, you are operating blind. And operating blind at scale means losing money you cannot even measure.

Building Resilience Into Your Supply Chain

1. Never rely on a single fulfillment channel. FBA + a 3PL or internal warehouse. Always.
2. Reconcile every inbound shipment. Count what you sent and verify what was received.
3. Invest in inventory management software. Spreadsheets stop working past $500K in revenue.
4. Build relationships with your fulfillment partners. A 3PL that understands Amazon standards will save you more money than one that offers the lowest price.
5. Plan for the worst. If your manufacturer goes down, if a port closes, if Amazon restricts inbound. Have a plan.

Andrew Morgans is the founder and CEO of Marknology, a Kansas City-based Amazon agency that has managed over $2B in revenue across 300+ brands. For more supply chain and Amazon strategy insights, tune into Startup Hustle or visit our Media Hub.