Ecommerce Inventory Insurance: 3PL Warehouses and In-Transit Gaps

Most of the stock sitting at your 3PL right now is effectively uninsured. A standard business owners policy caps off-premises inventory near $10,000. Ecommerce inventory insurance covers what the business policy leaves out. It protects goods at a third-party warehouse and goods moving in transit. Inland marine and stock throughput close that gap.

Each one fits a different stage. The split comes down to what your 3PL contract pays when it loses a pallet, and what coverage costs as you scale.

Does my business insurance cover inventory stored at a 3PL?

Mostly no. A standard ecommerce business owners policy, or BOP, covers business personal property at your scheduled address. But it caps inventory off-premises or in transit at roughly $10,000. Property of others in your care gets only about $2,500. Once meaningful stock sits at a 3PL, that inventory is effectively uninsured.

A BOP rates your premium around the location you list on the application. The off-premises and in-transit sublimit is the small bucket meant for a laptop you take to a trade show, not a warehouse full of stock keeping units (SKUs). Forms vary. That sublimit lands anywhere from $5,000 to $25,000 depending on the carrier and endorsements. The separate care, custody, or control extension under standard industry (ISO) forms tops out around $2,500 per premises. It covers other people's property you hold, not your own goods stored at someone else's building.

That gap is one of the biggest ecommerce business risks for any brand that has handed fulfillment to a 3PL. Closing it usually means inland marine coverage. The Insurance Information Institute describes inland marine as protecting goods in transit or temporarily warehoused by a third party. That mechanism is the foundation of proper 3PL inventory insurance.

Inland marine vs stock throughput: which one covers my inventory?

Inland marine insurance is the floater most ecommerce sellers buy, covering inventory in transit and temporarily stored off-premises, scheduled by location. Stock throughput is a marine policy that covers inventory continuously, from the overseas supplier all the way to final-mile delivery. One policy follows the goods through ocean and inland transit and through every 3PL, with one deductible per occurrence. Inland marine fits a single domestic 3PL; stock throughput fits multi-3PL importers.

A floater is a policy that follows your goods rather than sitting at one fixed address. Under the inland marine form, stock in transit and stock parked at a third-party warehouse are both covered. Each location is listed (scheduled) on the policy. Stock throughput is cradle-to-grave cover. One policy responds anywhere from the factory dock to your customer's doorstep. There is no argument over which insurer pays for a loss between two legs of the journey.

If you run a single domestic 3PL and hold modest values, inland marine usually handles it. Once you add a second 3PL and import goods by ocean, stock throughput closes the seams that a property policy and a separate marine policy leave open. This is inventory and property risk, separate from the customer-injury exposure covered by product liability insurance.

If my 3PL loses my inventory, what does it actually pay?

Far less than the goods are worth. Industry-standard 3PL warehouse liability is capped at about $0.25 to $0.50 per pound, and it only applies when the loss results from the 3PL's own negligence. A pallet of high-value SKUs worth thousands can be reimbursed at a fraction of that. That is why 3PL contracts expect you to carry your own inventory coverage.

The cap comes from warehouse legal liability, which protects the 3PL against its own mistakes rather than insuring the value of your goods. That figure is "released value," the per-pound number you accept by default when you sign without declaring the true worth of what you store. To find your real exposure, read the limitation-of-liability clause in your 3PL agreement. It usually sits near the end and spells out the per-pound cap, the negligence standard, and any option to declare a higher value for a fee.

WarehouseQuote's 3PL Warehouse Liability Guide documents the typical $0.25 to $0.50 range. The same contracts then require you to carry your own all-risk inventory insurance, because they know the cap won't make you whole.

A homewares brand selling ceramics once had a pallet damaged at its fulfillment center. The wholesale value ran into the thousands, but the 3PL paid out released value, which came to pennies on the dollar against what the stock was actually worth. (Most operators read that clause for the first time after the claim, not before.)

Does FBA cover my inventory loss?

Amazon offers reimbursement, not insurance, and the payout is narrower than most sellers assume. Since March 31, 2025, FBA reimburses lost or damaged inventory at manufacturing cost rather than retail price, per Amazon's FBA reimbursement policy. Manufacturing cost is what you paid to produce the item. It excludes shipping, handling, and customs duties. So even a clean claim leaves part of your landed cost on the table.

FBA reimbursement also covers only losses Amazon causes inside its own fulfillment centers. Inventory stolen in transit to Amazon falls outside it, and so does stock mishandled during the returns process. Those gaps sit apart from Amazon's insurance requirement for sellers, which is about carrying a certificate of liability coverage for customer claims. One protects Amazon from your products; neither one replaces the value of inventory you actually lose.

Is my inventory insured while it is in transit and on the water?

Not automatically. A trucker's cargo liability and an ocean carrier's liability are capped well below your goods' value. Under FOB (free on board) origin terms, you own the in-transit risk the moment goods leave the supplier's dock. Inland marine covers the domestic leg. Stock throughput or marine cargo covers the ocean leg most importers don't realize they own.

On the road, the Carmack Amendment makes a motor carrier liable for lost or damaged freight. But the carrier can limit that liability to a declared released value. The cap often falls far below what your goods are actually worth.

The ocean leg works differently. A marine cargo policy uses Institute Cargo Clauses, and the letter tells you how much is covered. Clause A is all-risk and the broadest. Clause B adds named perils like flooding and derailment. Clause C pays only for major casualties such as a fire, sinking, or collision.

FOB origin: who owns the on-water risk

FOB origin means the title and the risk pass to you at the supplier's loading dock. The freight is yours the entire voyage, even though you never touch it. Most DTC importers buy FOB origin without realizing they just became the on-water insured party.

Theft is the other live risk, and it is climbing fast. US and Canada cargo theft losses reached roughly $725 million in 2025, up about 60% year over year, according to Verisk CargoNet. The average value was near $274,000 per theft. "Criminal enterprises are becoming more selective and sophisticated, targeting extremely high value shipments rather than relying on opportunistic theft," said Keith Lewis, Vice President of Operations at Verisk CargoNet. For a brand moving a container of premium SKUs, that is a reason to confirm your in-transit cargo insurance actually follows the goods door to door.

When should I switch from inland marine to stock throughput?

Stock throughput becomes the better fit once your footprint grows beyond a single warehouse. Move to it when you store inventory at two or more 3PLs. The same applies once you import goods by ocean or air under FOB origin terms, or hold more than about $1M at any single location. Stock throughput handles a loss anywhere in the chain under one policy and one deductible, instead of leaving you to argue over which policy responds.

A few signals usually mean you have outgrown an inland marine floater.

• Inventory split across two or more fulfillment centers
• Ocean or air imports where you own the on-water risk at the supplier's dock
• High value concentrated at one warehouse
• Peak-season value that spikes 1.5 to 2 times your average

One DTC apparel brand we worked with started FBA-only, added two regional 3PLs, and began importing overseas. A single inland marine claim fell into the gap between its marine and property policies, and nobody could agree which one paid. These triggers are broker judgment rather than a published rule. Coverwatch traces the full inventory journey, flags which legs are uncovered, and negotiates per-location and CAT (catastrophe perils) sublimits when placing the policy. It also helps to review your 3PL footprint at renewal.

How much does stock throughput insurance cost for my brand?

Stock throughput is priced as a single rate applied to your annual sales or to your average and peak inventory values, rather than a flat premium. Cost scales with turnover and product category. Marine deductibles run lower than property deductibles. Expect roughly $1,000 to $5,000 in transit and $10,000 to $50,000 for stored inventory.

The rate itself moves with what you sell. Carriers price up categories that fail in predictable ways. Lithium-ion batteries, perishable supplements, and fragile or high-theft goods all draw higher rates. A clean schedule of every storage location, with accurate values, does more for your rate than almost anything else. When underwriters can see exactly where your stock sits and what it is worth, they don't have to price in their own uncertainty. Vague or missing location data invites a loading you do not need to carry.

This is the same logic behind ecommerce insurance cost by revenue tier. Better information lowers the price. Catastrophe perils such as flood and named windstorm are often written at full limit in the London stock throughput market. They carry fixed-dollar deductibles rather than a percentage of the loss. That keeps a coastal warehouse hit from wiping out your recovery.

Coverwatch maps your inventory from the supplier dock through every 3PL to your customer's door and identifies the uninsured legs. It then places inland marine or stock throughput from specialist marine markets for a flat fee. Start by pulling your 3PL contracts and a current list of where your stock sits, then ask a broker to price the gap.