Amazon Warehousing and Distribution (AWD) is pitched as the simple, cheaper way to hold upstream inventory and feed FBA. In 2026, with Amazon's fee increases and a new fuel surcharge biting, a lot of sellers are asking whether it actually is. On an episode of MerchantSpring Marketplace Masters, Ephraim Ausch, Chief Logistics Officer at Tactical Logistic Solutions and a former Amazon seller, gave the unglamorous answer: it depends entirely on the math, and most brands haven't done it properly. His opening question to any client considering AWD is simply, “Did you crunch the numbers?”
The Break-even Math: Fast Movers Versus Slow Movers
The reason the answer is never one-size-fits-all is that AWD's cost structure is lopsided. It is more expensive than a typical 3PL on the way in, more expensive on the way out, and more expensive on storage. Where it wins is the transportation leg from AWD into FBA, which is cheap. So AWD pays off when you move product through it quickly and lose on the expensive parts for as little time as possible.
That gives a usable rule of thumb. For fast movers, you hold in AWD for a month or two at most; AWD tends to make sense. For slow movers, Ausch says the break-even sits around two months; across the 500-plus brands his team has analysed, once product sits in AWD beyond roughly two and a half to three months, a 3PL usually comes out cheaper. His warning is that many sellers assume Amazon must be cheaper because it is Amazon, do a partial calculation, and miss that the storage and the in-and-out fees quietly outweigh the trucking saving. If you are holding inventory in AWD longer than two months, that is the signal to re-run the full comparison against your old 3PL rates.
Where AWD Stings, and the 2026 Fee Increases That Made It Worse
AWD prices storage and the transportation-to-FBA leg on cubic feet, and charges a flat processing fee per box on the way in and out. Those increases landed hard in early 2026. From 15 January, West-region storage rose about 19% to $0.57 per cubic foot (versus $0.48 in the other regions), the transportation base rate climbed roughly 22% to about $1.40 per cubic foot, and inbound and outbound processing now run about $1.40 per box each way (Nova Analytics). On top of that sits an ongoing fuel and logistics surcharge of around 3.5%. None of this is fatal on its own, but it widens the gap on exactly the products AWD handles worst.
The Master-carton Test: Which Products Actually Fit AWD
Because processing is charged per box, the single most useful proxy Ausch offers is units per master carton. Sell something small and dense, say 400 pens in a carton, and the per-box in-and-out fee plus the cubic-feet charges spread across so many units that they barely register; AWD can genuinely make sense. Sell bulky items where only one to four units fit in a carton: glass jars, coffee machines, light fixtures, baskets, bins, and the roughly $2.80 in-and-out per box is now landing on one or two units, on top of high cubic-feet storage and transport. That is where AWD gets expensive fast, because most 3PLs are well under $2.80 to receive and ship a box and cheaper on storage too.
There is a packaging lever hiding in here. Ausch regularly finds brands shipping four units in a 20-pound box that could hold eight or ten and still stay under Amazon's 50-pound limit. Since the processing fee is per box, filling the box lowers your per-unit in-and-out cost, as long as you don't inflate the cubic-feet dimensions and give back the saving on storage and transport. The broader takeaway is to understand exactly how the cost structure works, then ask whether your packaging and carton configuration are actually optimised for it. For decoding the fee acronyms along the way, MerchantSpring keeps a retail and Amazon vendor acronym glossary.
The West-region Squeeze: Entry Point Matters Again
With West-region costs up, the old default of railing everything through Los Angeles and Long Beach deserves a second look. Ausch frames it as apples to apples. The West Coast is faster to bring product in, so if speed is the priority, it still wins. But if the priority is cost, you weigh the AWD increase against the higher ocean-freight and transport cost of routing to the East Coast, which carries a longer journey and lead time. If paying, say, an extra $800 in ocean freight to the East Coast still nets out below what you would save on freight minus the West-region AWD increase, the East Coast is the better call. The Midwest, he is blunt, rarely makes sense; the pricing and the longer transit time mean if the East Coast doesn't add up, the Midwest is worse.
Unpredictability, No Priority, and the Auto-replenishment Trap
Performance has improved since 2024 but remains unpredictable, and it worsens before every peak. Ahead of Prime Day or a season, receiving into AWD slows, and the West Coast lags the rest of the country. Ausch's question for larger sellers is whether they can afford that uncertainty: if you don't know whether it will take one, two or three weeks to land in FBA and your product is seasonal or spiking for back-to-school or a holiday, you cannot risk AWD being the reason you go out of stock. And no, AWD does not buy you priority. He was told directly by a senior Amazon employee in the division that nobody gets to cut the line; AWD flows into FBA through the same process as Amazon's partnered carriers.
The feature to be most careful with is auto-replenishment. Left on, AWD reads your last 30 days of sales and auto-generates shipments into FBA. If last month spiked and this month will cool, that logic overstocks FBA, where storage is far more expensive than upstream, and if you later pull the excess back out, removal fees plus the 3-to-4% of units that get damaged in transit can erase the product's margin. Ausch's preference is to send into FBA manually rather than trust the automation. It underlines his framing of AWD as, in effect, a 3PL with a very limited set of services, worth using only when the price is right and the product fits.
Why Enterprise Brands Never Go All-in, and Where to Push Your 3PL
Among the eight and nine-figure sellers Ausch has worked with, not one uses AWD for everything. The pattern is a buffer: they keep stock for their whole catalogue in a 3PL or their own warehouse, outside Amazon's network, precisely so a backlog, delay or loss inside AWD never puts them out of stock. At enterprise scale, running out is the one outcome you cannot afford. Products that always need prep are ruled out of AWD entirely, and on the direct-to-consumer side, Multi-Channel Fulfillment tends to be cheapest only for light items around three to four pounds; once an average order contains more than one unit, an outside 3PL is usually cheaper.
On the 3PL itself, 2026 is a year to renegotiate. Fuel, ocean freight and trucking have all jumped, so Ausch points sellers at the variable parts of their contract: charges based on cubic feet, or paying a full pallet rate when only two boxes came in, are where there is room to restructure toward fixed, predictable per-box or per-pallet pricing. Push on service levels too. A 3PL taking a week or ten days to get an order ready should not be acceptable; as a benchmark, his own operation turns B2B orders around in 48 hours and DTC same or next day. Those are concrete asks to bring to the table.
The Real 2026 Move: Run the Numbers, Then Diversify
Ausch's wider read is that the COVID-era habit of overpaying for logistics is finally being audited out. Sellers are running what he calls a DNA test on their costs, asking where they are being taken advantage of and where they can save, because most brand owners are passionate about the product and under-experienced on logistics, and tend to trust their provider too much. Sometimes the answer is to route a fast mover straight into FBA and skip the 3PL; sometimes it is the reverse. The point is to decide from numbers, not habit.
The second half of the move is diversification. Concentrating everything on Amazon carries real risk: rising fees, a listing shutdown, a competitor tactic that knocks you offline. Ausch sees the brands that are thriving spreading across TikTok Shop, their own Shopify stores, Walmart, Target, Best Buy's new marketplace and more, while sellers under about three million dollars who never looked hard at logistics or diversification are falling out of the system. Part of it is cost, and part of it is control: your own store means your brand and your customer, rather than operating at Amazon's discretion.
Crunch the Numbers on Your Real Per-unit Profit
“Did you crunch the numbers?” is only answerable if you can see your true cost and profit per unit. MerchantSpring's profit reporting breaks down FBA fees, storage, advertising, returns and 20-plus P&L lines for every ASIN and account, so you can actually compare AWD against your 3PL instead of guessing (MerchantSpring Amazon selling fees guide). See it on your own accounts with a walkthrough of your data.
