Every marketplace you add shouldn't mean another pile of inventory to forecast. At ProShip3PL, one pool on our Medley, FL racks serves them all — Amazon, Shopify, eBay, Etsy, Walmart — with each unit committed to a channel only at the moment a real order claims it.
Sellers rarely plan their way into channel-splitting; they drift into it. FBA gets its shipment, the Shopify app connects to some other fulfillment service, eBay ships from home, and Walmart gets whatever's left. Four piles, four counts, four chances to be wrong about where demand shows up.
The damage is quiet but constant. A promotion spikes Shopify while eBay's allocation gathers dust. Amazon runs dry mid-month while units earmarked for Etsy sit untouched. Moving stock between piles means freight, relabeling, and days of lost availability — so mostly, nobody moves it.
A shared pool deletes the guessing. Your full inventory sits in one place — our racks in Medley — and every channel lists against it. The split isn't decided when you buy inventory; it's decided order by order, at pick time, by actual customers. Demand allocates the stock, not a spreadsheet from last quarter.
| With split stock piles | With one shared pool |
|---|---|
| Allocation guessed months early | Allocation settled per order, at the pick face |
| Overselling on the hot channel | All channels draw down one synchronized count |
| Dead stock stranded on slow channels | Every unit stays available to whichever channel sells |
| Rebalancing = freight + downtime | Rebalancing doesn't exist; nothing to move |
| A stockout darkens one platform | Pool keeps all listings live until it's truly empty |
All your channels advertise availability from the same shared count — no per-platform reservations up front.
A Shopify checkout, two eBay sales and an Amazon FBM order land in one pick queue, tagged by channel.
Units come off the same rack locations first-come — with optional floors that protect stock for a priority channel or a pending FBA transfer.
Shipments confirm with tracking per platform, and remaining availability updates everywhere at once.
Merchant-fulfilled orders ship direct while the same pool sends replenishment batches into FBA — details on our FBM fulfillment page.
Your DTC orders picked and packed with your branded unboxing — the channel where packaging is yours to design. See Shopify fulfillment.
Marketplace orders shipped with the tracking discipline eBay's seller standards reward — covered on our eBay fulfillment page.
Careful packing for the handmade and boutique goods Etsy buyers expect to arrive looking gift-ready.
Marketplace orders shipped direct, plus WFS-compliant prep when you'd rather push stock into Walmart's network.
The same pool can ship cartons and pallets to retail buyers — see B2B & wholesale fulfillment.
With a shared pool that launch keeps selling until the building is empty. The eBay units were never really eBay's — they were yours, waiting for whichever buyer came first.
Overselling is what split counts do under load. One synchronized pool, drawn down pick by pick, closes the gap between what platforms advertise and what exists.
It shouldn't. A new channel on a shared pool is a connection, not a purchase order — Walmart starts selling the stock you already own.
Invert the flow: hold the pool outside, feed FBA in velocity-sized batches, and let every other channel ship direct from the remainder.
It means one warehouse holds one pool of your inventory and ships every sales channel from it: Amazon FBM orders, Shopify checkouts, eBay and Etsy sales, Walmart marketplace orders — plus replenishment shipments into FBA and WFS. Instead of maintaining separate stock piles per platform, every channel draws from the same racks at the moment an order arrives.
Because you have to predict, months ahead, how a production run divides across marketplaces — and the prediction is always wrong somewhere. One channel oversells and refunds buyers while another sits on dead stock it can't hand back. A shared pool removes the forecast entirely: units commit to a channel only when a real order claims them.
Allocation happens at pick time, not purchase time. All channels list against the shared pool; when orders arrive, each is picked first-come from the same rack locations, and availability updates flow back so the platforms stay honest about remaining stock. You can also reserve floors for a priority channel — for example, protecting units for an FBA replenishment before a wholesale order drains the pool.
Amazon (FBM orders plus replenishment into FBA), Shopify, eBay, Etsy, and Walmart — both marketplace orders we ship directly and prep for Walmart WFS. Other carts and marketplaces are usually workable through the order tools you already run; tell us your channel list and we'll confirm each one during onboarding.
They can. A common setup: branded boxes and inserts for Shopify orders where the unboxing is yours, plain compliant packaging for marketplace orders, and Amazon-spec prep for anything headed into FBA. Pack rules are set per SKU per channel during onboarding and applied automatically at the pack station.
Two mechanisms: stock levels sync back to your platforms as orders ship and receipts land, and picks are deducted from one count rather than five parallel guesses. Compared with running split piles in different locations, a single synchronized pool is structurally harder to oversell — the count disagreements that cause phantom availability never get created.
Yes, and that's the strongest version of the model: the pool feeds FBA in replenishment batches sized to velocity, while FBM, Shopify, eBay, Etsy and Walmart orders ship direct from the remainder. When FBA stocks out, direct channels keep selling; when a direct channel spikes, you slow the next FBA transfer. The pool is the shock absorber.
All roads lead back to the same dock. Returns from any channel are received against the original order, inspected and graded; sellable units rejoin the shared pool and become available to every channel again — not just the one that sold them. That cross-channel recovery is something siloed fulfillment can't do.
Amazon can ship non-Amazon orders from FBA stock, and for some sellers that's enough. The trade-offs under Amazon's current terms: Amazon-branded or Amazon-controlled packaging options, fulfillment priorities you don't set, and stock locked inside a network you can't inspect or rework. A 3PL pool gives you custom packaging, your own priorities, and inventory you can touch. Some sellers run both and compare.
List your channels, monthly orders per channel, and rough SKU count in the form. Pricing is per order picked and packed plus monthly storage for space used — no setup fee, no minimums, and a rate sheet back within one business day.
Tell us the platforms you sell on, orders per month on each, and your SKU count. We'll design the pool — including any channel floors you want protected — and send per-order pricing within one business day.
