There are three big questions that your buyers have before you get a conversion; Is it in stock? How quickly can I get it? Does it show up right?
Every purchase on Amazon goes through some form of those three questions. Think about someone buying a last-minute gift with no wiggle room for a return. A shopper will filter by their location (is it available), check delivery time, and then read the reviews (does it show up broken or as promised?).
In this article, we’ll go over how your logistics and operations choices can impact your conversions and customer experience, and how to improve both with more strategic choices.
Your keywords and logistics are inter-dependent
Sad as it is, you can win the keyword but still lose a sale on Amazon. If you have two sellers on the top results of the same search term, even with similar content quality and bid, shoppers will look at factors like delivery date and reviews.
Andy Jassy’s 2024 letter to shareholders said “When we promise faster delivery times, customers complete purchases at a meaningfully higher rate and shop with us more frequently.”
Speed is a conversion variable and purchase-rate consideration, straight from the data banks of Amazon. ZonPrep has also noticed that conversion rates improve by 23% or more when products are Prime eligible versus when they are not.
How Prime eligibility actually works
A quick reminder to sellers is that checked-in and Prime-eligible are different states for your inventory.
A shipment sent to a single destination lands at a national inbound cross-dock. It gets checked in there, and at that point the units are technically sellable, but they are not yet Prime eligible. Amazon then re-sorts and splits that freight out to regional inbound cross-docks, and from there to fulfillment centers. Prime eligibility starts when the unit reaches a localized fulfillment center.
Here’s a rough timeline of how your inventory moves (when paying placement fees):
- Seller’s warehouse to National IXD: 10+ days
- On to Regional IXD: 30+ days
- On to the fulfillment center: 43+ days
And inbound check-in sits on top of all of that. Across the industry we see check-in itself running anywhere from 7 to 43 days depending on shipment type and season.
If you pay inbound placement fees and send everything to a single location, you can expect Prime eligibility to take a minimum of 26 days, and often more.
However, you can speed that up with optimized splits. ZonPrep clients typically see between 6 to 10 days to Prime eligibility, because the freight goes to regional locations directly instead of paying to have Amazon redistribute it later.
Note: Time to Prime eligibility figures are based on actual shipment data from current ZonPrep clients, tracked and verified by our team. Individual results may vary based on product category, shipment volume, and Amazon receiving conditions.
In-stock is regional, not national
Even when you’re fully stocked, your customers don’t all live in one place. The delivery dates they see depend on where your units are sitting; a fulfillment center close to them, or a few states away?
Amazon astutely built their fulfillment network around demand. In their 2023 shareholder letter, they said they “re-architected the network to store items closer to customers.” Position is more strategic than quantity (and better for your storage costs).
DeepM’s readers should find this familiar. There is search data shaping your outcomes that you cannot see from inside Seller Central, and there is supply chain data shaping your conversion rate you need to consider.
Make Sure It Shows Up Right
Arriving quickly is just one of the pieces that go into your customer experience. Your items still need to show up well. Neatly and intentionally packed, nothing broken, and the buyer shouldn’t need to wrestle inconvenient packaging to get to their item.
Incorrect labeling means the wrong item may show up. Lack of proper prep could mean items get damaged. Those mistakes trigger returns and bad reviews, which then impacts your inventory, cash flow, and brand perception–which impacts conversions. The returned unit is now sitting in the network as unsellable inventory, occupying capacity you are paying for. Amazon has recently started highlighting if products are frequently returned or not, below the buy box. One defective batch can harm your rank, your reviews, and your conversion rates.
Provision, Presentation, and Protection
It helps to be precise about what prep is actually for, because “prep” gets treated as a single undifferentiated service and it is three separate jobs.
Provision. The product has to be available. This is question one, and sections above cover it: availability is not a national number, it is a regional position.
Presentation. The unit has to be precise and deliberate. This is the job that gets underestimated most. If you sell something as a set, it has to arrive as a set, presented as one thing, every single time. A three-piece bundle that shows up as three loose items is not a minor cosmetic issue. To the customer it is the wrong product. To Amazon’s systems it can be three units where there should have been one. And to your reviews it is a complaint about something you never intended to sell.
Protection. The unit has to survive the trip. Shrinkwrap is doing two jobs at once here: it keeps the pieces of a set or bundle together so the presentation holds, and it protects the product through everything between our floor and the customer’s door. Those are different failures with the same fix, which is why the wrap spec is not a detail to overlook.
All of the above need to be present for a good customer experience. If you miss any one, the other two aren’t enough.
The cost of sloppy packaging
Amazon is explicit about how both of its main FBA charges are calculated. Fulfillment costs “are based on the product’s price, weight, and dimensions.” Storage is “charged monthly based on the space your inventory occupies in Amazon’s fulfillment network,” calculated on your daily average volume in cubic feet.
So every unnecessary inch of box, every bit of void fill you did not need, every carton larger than the product requires, is dimensional bloat. It pushes your dimensions up and consumes more cubic feet, which affects your storage fee every month those units sit there.
You may not need to care about this for a few units, but if your entire catalog is inefficiently packaged that’s a lot of wasted spend over a year. Right-sizing packaging means you stop paying to ship and store air.
The 5-Box Rule
Amazon splits inbound shipments across five regional destinations. That means to actually achieve that split, you need at least five boxes per SKU.
Below five boxes per SKU, the split options are not really available to you and the default path is paying placement fees to send everything to one location. At five or more, the option opens up. And above that threshold, splitting beats paying placement.
Amazon has designed things this way to reward their preferred behavior; they want you to send your inventory directly to where it needs to be. Splitting gets your units closer to your customer from day one.
3 Common Amazon Logistics Misconceptions
We’re on FBA. Everyone has Prime, so it’s a level playing field.
Multiple FBA sellers can offer inventory under Prime, but the one with units already in the right regional fulfillment center shows delivery tomorrow while the other shows a day later. When you both have the badge, the next thing shoppers look at is the date underneath.
Checked in means we’re selling.
Checked in at a national cross-dock makes units technically sellable. Prime eligibility happens at the fulfillment center, and a lot of the waiting time comes into play between national to regional.
Placement fees aren’t the only cost of sending to one location.
Placement fees are just the cost you can see on your invoice. But consider the time it takes for your inventory to get closer to your buyer, and the loss of conversions that come with it.
Your Next Steps
If you take nothing else from this: your conversion rate depends on your supply chain, so make sure your items are available, protected, and deliberately prepped.
Check these three things this week;
- Pull your SKU list and find the ones that clear five boxes per shipment.
- Look at your inventory position by region against where your orders actually come from, not against your total on-hand.
- Take your ten highest-volume SKUs and check their packed carton for space you can save. Are you still using polybags? Every unnecessary inch impacts your fulfillment fee and storage every month those units sit there.
If those three checks turn up something you do not like, ZonPrep runs a complimentary FBA Opportunity Analysis: a side by side comparison of your current inbound performance against the same volumes run through our facilities. ZonPrep operates 600,000 square feet across two facilities in McDonough, Georgia, moving more than 10 million units a month into Amazon for over 200 brands. We were founded by former Amazon sellers, for Amazon sellers.
About the Author
Lou Casados is a sales leader and operations strategist at ZonPrep, an Amazon FBA prep and cross-dock logistics company based in McDonough, GA. With deep expertise in FBA supply chain optimization, Lou helps Amazon sellers reduce inbound shipping costs, streamline compliance, and scale their operations without the friction. Lou leads a high-performance sales team and is a regular voice on best practices in Amazon inbound strategy, seller enablement, and logistics efficiency.
