Amazon inventory management is not the glamorous part of ecommerce. Nobody posts about it on Instagram. But after 11 years and 300+ brands at Marknology, I will tell you this: if I had a ten commandments of selling on Amazon, the first three are inventory, inventory, inventory.
On the Startup Hustle podcast, I sat down with Conrad from Clearinity to talk about the real pain of inventory management. What I shared on that episode still holds true today: "I've been on the fast track to learning business at a young age simply because I've been in the minds of the 300 brands we've worked with. And inventory management is a huge, huge, huge challenge."
Why Inventory Management Is Priority #1
You can have the best listing on Amazon. The most beautiful photography. A perfectly tuned PPC campaign. None of it matters if you are out of stock.
Going out of stock on Amazon is not like running out of inventory in a retail store. When you stock out on Amazon, you lose your organic ranking. You lose your Best Seller Rank. You lose the momentum that took you months to build. And getting it back? That can take weeks or even months of heavy advertising spend.
The math is brutal: a 2-week stockout on a product doing $50K/month does not just cost you $25K in lost sales. It costs you the organic rank you built, the advertising efficiency you earned, and the customer trust you developed.
The Pandemic Lesson That Changed Everything
COVID was the wake-up call nobody wanted. I talked about this on the podcast: "The people that had the cut and clean Amazon FBA businesses got screwed during the pandemic. They got absolutely screwed."
When Amazon restricted inbound shipments to essential goods only, brands that relied 100% on FBA were left helpless. They had products sitting in warehouses with no way to sell them. Meanwhile, the brands we had set up with FBM (Fulfilled by Merchant) backup options kept selling.
"I was so grateful for all the brands that had made that move, that extra work of having double SKUs or setting up that 3PL. When the pandemic hit and Amazon went to essential goods only, those FBM businesses exploded."
Always Have a Backup to FBA
This is non-negotiable advice from someone who has watched hundreds of brands navigate Amazon: you MUST have a fulfillment backup to FBA.
At Marknology, we built our own fulfillment operation. We call it Fulfillment by Marknology, which is a play on FBM. "We really set it up so I could keep control of inventory, be able to prep it for Amazon, include inserts, maybe create kits, variety packs, and do it at the drop of a hat without needing a massive 3PL."
Whether it is your own warehouse, a 3PL, or even a hybrid setup, you need the ability to flip a switch and fulfill orders yourself when FBA cannot.
Multi-Channel Means Multi-Headache
Conrad from Clearinity explained the complexity perfectly: "The moment we introduce the multi-channel strategy, inventory management is now a whole new ball game. Most of our clients are at least 50/50 between their own website and Amazon."
If you are selling on Amazon, Shopify, Walmart, and maybe a few retail accounts, you need a system that:
- Tracks inventory across all channels in real time
- Prevents overselling when demand spikes on one channel
- Handles different fulfillment methods (FBA, FBM, 3PL, direct)
- Manages EDI connections for retail accounts like Chewy or Home Depot
- Gives you the data to make smart reorder decisions
Horror Stories You Can Learn From
Conrad shared a story on the podcast that is still seared into my memory: "Someone bought a product, tried it for two days, returned it. Amazon checked it back into stock. Someone had left human feces in the package. Amazon resold that same unit."
That is an extreme example, but the lesson is universal: when you rely 100% on Amazon to handle your products, you lose control. Other horror stories we have seen:
- Amazon losing 60,000 units on inbound shipping
- Canada's logistics shutting down over the holidays, wiping out Q4 for brands
- FBA warehouse damage going unreported until customers started leaving 1-star reviews
A Practical Inventory Framework
- Forecast 90 days out minimum. Use historical sales data, seasonal trends, and planned promotions.
- Maintain FBM backup. Have a 3PL or warehouse ready to fulfill orders if FBA has issues.
- Diversify geographically. "The moves are becoming how do we get off the coast and into the Midwest. Multiple warehouses where we can ship quicker to customers at a cheaper price."
- Invest in software. Manual spreadsheets break at scale. Cloud-based inventory management tools pay for themselves.
- Monitor profitability per channel. "Do you know your profitability on your shipping? Are you losing sales because you're priced too high, or losing money because you're not charging enough?"
"If I had a ten commandments of selling on Amazon, the first three are inventory, inventory, inventory." — Andrew Morgans, Startup Hustle
Listen to the full episode: How to Manage Your Inventory
Hear more from Drew on the Marknology Media Hub.
Get Your Inventory Right
Inventory problems compound fast. At Marknology, we help brands build fulfillment strategies that protect their Amazon business and support growth across all channels. We have been doing this since 2015 with $2B+ in managed revenue.
Book a free strategy call and let's make sure inventory never holds your brand back.