Understanding the different types of inventory helps provide a clearer picture of inventory management in logistics. Safety stock, alert stock, available stock, physical stock, and stock in transit: each concept addresses a specific need. In this article, you’ll learn why there are several types of inventory, how to easily distinguish between them, and in which cases these differences become critical in e-commerce.
In logistics, inventory refers to all the goods held by a company to meet demand, secure supply, and ensure the continuity of operations.
This definition seems simple. However, in reality, inventory can never be interpreted in just one way. An item may be physically present in the warehouse, already reserved for an order, in transit between two locations, nearing its expiration date, or simply not selling well. This is precisely why there are several types of inventory.
- What is inventory in logistics?
- Why are there different types of inventory?
- What are the main types of inventory you should know about?
- What are the differences between the various types of inventory that should not be confused?
- In what situations do the different types of inventory become an issue?
- Why does inventory visibility quickly become essential?
- How can you make your inventory more transparent and reliable with Shippingbo?
Understanding the different types of inventory helps you better understand what’s actually happening in a logistics warehouse. For a logistics manager, an e-commerce manager, or an executive, this is what helps distinguish what is actually sellable, what protects against stockouts, what needs to be restocked, and what unnecessarily ties up space and cash flow.
The purpose of this article is not to provide a comprehensive overview of inventory management. The goal is to clarify the concepts: what is logistics inventory, why do multiple categories coexist, what are the different types of inventory, what distinctions should not be confused, and in what situations do these distinctions become relevant in e-commerce.
What is inventory in logistics?
Before going into detail about the categories, we need to start with a clear foundation. In logistics, inventory is not just a quantity of stored products. It is an operational resource that enables us to meet demand, absorb fluctuations, and ensure a steady flow of goods.
A Simple Definition of Inventory
La définition stock logistique la plus simple est la suivante : le stock correspond à l’ensemble des marchandises détenues par une entreprise à un instant donné pour répondre à ses ventes, à ses engagements clients ou à ses besoins d’exploitation.
In other words, inventory refers to what a company has available to sell, prepare, ship, or use to support its operations. This may include finished products, items in stock, goods in transit, or units already allocated to orders.
Why Inventory Is Essential in the Supply Chain
In a theoretical world, a company would receive a product at the exact moment a customer orders it. In reality, this system would be too fragile. Demand fluctuates, supplier lead times change, carriers fall behind schedule, and certain sales channels suddenly ramp up shipments.
Inventory therefore acts as a buffer. It prevents an unforeseen event from immediately leading to a stockout. It also helps ensure consistent fulfillment of customer promises, especially in e-commerce, where fast order fulfillment and reliable shipping have a direct impact on customer satisfaction.
Stock, inventory, and procurement: What are the differences?
Inventory refers to what the company hason hand. An inventory count involves counting and verifying what is actually present to compare the physical count with the data in the system.Replenishment refers to the process of bringing in new goods to maintain a consistent inventory level.
In other words, stock refers to the available material, inventory is used to verify that the stock levels are accurate, andprocurement or replenishment is used to prevent those levels from becoming insufficient.
Why are there different types of inventory?
If we were to talk about “inventory” as a single, undifferentiated concept, the interpretation would quickly become misleading. A given product may be physically present but already reserved. It may be in the process of being transferred between two locations. It may also be available in limited quantities due to an approaching expiration date or pending quality control.
The various types of inventory therefore exist to better describe the reality of the flow of goods.
Specifically, these distinctions serve to:
- better anticipate fluctuations in demand;
- ensure reliable lead times;
- adapt inventory counts to the nature of the products;
- to know what is actually available for sale.
Responding to Fluctuations in Demand
Demand is never completely stable. A promotional event, a peak sales season, a marketplace feature, or a marketing campaign can very quickly boost sales. Certain types of inventory exist specifically to absorb this variability, such as safety stock or seasonal inventory.
Ensuring a Secure Supply
The second factor is lead times. A supplier may deliver late, a shipment may be incomplete, and an imported item may take longer than expected to return to stock. That is why we distinguish between concepts such as safety stock, minimum stock, and maximum stock.
Adapt storage to the nature of the products
Tous les produits ne posent pas les mêmes contraintes. Un cosmétique, une pièce détachée, une ancienne collection textile ou un best-seller préparé tous les jours n’impliquent pas la même logique. C’est ce qui justifie des catégories comme stock périssable, stock dormant ou stock non périssable.
Gain a better understanding of what is actually available
Entre le stock physique, le stock théorique, le stock alloué et le stock disponible, un même SKU peut afficher plusieurs réalités selon l’angle de lecture. Plus l’entreprise vend sur plusieurs canaux, plus cette distinction devient structurante. Ce n’est pas parce qu’un produit existe quelque part dans l’entrepôt qu’il est réellement vendable immédiatement.
What are the main types of inventory you should know about?
There are many different classifications depending on the industry and organization. For an article on logistics, the most useful categories are as follows.
| Inventory Type | Lead Role | E-commerce Example |
| Stock de sécurité | Dealing with the unexpected | Avoiding a setback after a campaign that performed better than expected |
| Low Stock Alert | Initiate a restock | Follow up with a supplier before running out of stock |
| Minimum stock | Establish a minimum threshold | Ensure a minimum level for a strategic benchmark |
| Maximum stock | Limiting excess inventory | Avoid tying up too much cash |
| Seasonal inventory | Preparing for a Foreseeable Surge | Stock up before Christmas or Black Friday |
| In-transit inventory | Track goods in transit | View a restock that has already been shipped |
| Dormant inventory | Identify slow-moving items | Identify products that have been in stock for months |
| Perishable inventory | Take the product’s lifespan into account | Prioritize the sale of cosmetics or supplements |
| Physical inventory | See what is actually there | Verify the actual quantities counted |
| Stock disponible | Knowing what actually sells | Display the quantities still available for sale on the website |
Safety stock
Safety stock is a buffer quantity intended to account for unforeseen circumstances. It is used to cover supplier delays, unexpected spikes in demand, or temporary discrepancies between forecasts and actual results. In e-commerce, it can prevent a stockout on a product featured in a campaign that outperforms forecasts.
The emergency stockpile
Le stock d’alerte est le seuil à partir duquel il devient nécessaire de déclencher un réapprovisionnement. Ce n’est pas encore le niveau critique, mais le signal qui dit qu’il faut agir. Dans un contexte marketplace, il permet par exemple de relancer un fournisseur avant qu’une référence ne devienne indisponible.
Minimum inventory
The minimum inventory level represents the lowest level below which the company does not wish to fall. When this level is reached, the safety margin becomes small and the risk of stockouts increases.
Maximum inventory
The maximum inventory level sets the upper limit that must not be exceeded. It is used to prevent excess inventory, unnecessary clutter, tied-up cash, and a decline in inventory turnover.
Seasonal inventory
Seasonal inventory is built up in advance of a predictable peak. This could be Christmas, the sales season, Black Friday, or a peak period specific to a particular industry. It is not intended to absorb unforeseen events, but rather to prepare for an expected increase in demand.
In-transit inventory
In-transit inventory refers to goods that have already been shipped from one location to another but have not yet been received at the destination. These goods exist within the supply chain but are not yet available for order fulfillment.
Dormant inventory
Dormant inventory consists of items that sell very little or not at all during a given period. It isn’t necessarily dead stock, but it’s already a warning sign. It’s often found in older collections, variants with low demand, or SKUs that were launched on too large a scale.
Perishable inventory
Perishable inventory refers to products with a limited shelf life. Quantity alone is not enough: inventory must also be tracked over time, based on date, lot, or priority of use.
Physical inventory
Physical inventory refers to what is actually present in the warehouse. It is the on-the-ground view—what is observed during a count or inventory. However, a product that is physically present is not always immediately saleable.
Available inventory
Available inventory refers to the quantity that is actually available for sale or fulfillment at a given time. It may be less than the physical inventory, since quantities that have already been reserved, blocked, or allocated to orders must be subtracted. This data must be accurately reported to the website and marketplaces to prevent overselling.
What are the differences between the various types of inventory that should not be confused?
Knowing the definitions is helpful. Understanding the differences between similar concepts is even more so.
Safety Stock vs. Alert Stock
The difference between safety stock and alert stock lies in their functions. Alert stock is a trigger threshold. Safety stock is a protective reserve. The former is used to take timely action. The latter is used to maintain operations when reality deviates from the plan.
Physical Inventory vs. Available Inventory
The difference between physical inventory and available inventory is one of the most important distinctions in e-commerce. Physical inventory refers to what is actually on hand at the store. Available inventory refers to what can actually be sold or prepared for shipment. Between the two, there may be allocated inventory, reserved quantities, or inventory discrepancies.
Dormant inventory vs. excess inventory
Dormant inventory refers to the rate at which it is sold. Excess inventory refers to an excessive quantity. A product can therefore be in excess inventory while still moving quickly. Conversely, a product can become dormant even in small quantities.
Perishable Inventory vs. Non-Perishable Inventory
Perishable inventory must be managed with a focus on shelf life. Non-perishable inventory does not face this immediate constraint, but it can still become obsolete, move more slowly than expected, or result in excess inventory.
In what situations do the different types of inventory become an issue?
These distinctions become very clear as volumes increase, channels multiply, or the organization becomes more complex.
They become particularly useful when a company needs to:
- sell through multiple channels at the same time;
- manage multiple sites or storage areas;
- absorb seasonal spikes in activity;
- keep up with a rapidly expanding catalog.
The Case of an E-commerce Warehouse
In an e-commerce inventory environment, inventory tracking must keep up with a fast pace. Orders come in all day long, order fulfillment moves quickly, and sales channels must consistently show availability. In this context, the difference between physical inventory and available inventory is not a minor detail—it is essential to reliability.
The Case of a Seasonal Business
When a business relies heavily on peak sales periods, miscalculations can be costly. Too little inventory means lost sales. Too much inventory ties up cash unnecessarily after the peak. The concepts of seasonal inventory, maximum inventory, and safety stock then become very real.
The Case of a Multichannel Company
Dès qu’une entreprise vend sur son site, en marketplace, parfois en boutique ou via plusieurs entrepôts, la lecture devient plus complexe. Le même produit peut être disponible sur un canal, réservé sur un autre ou réparti entre plusieurs sites. C’est précisément dans ce type d’environnement que le stock omnicanal et les stocks multi-entrepôts nécessitent une lecture plus structurée.
The Case of Rapid Catalog Growth
When the number of SKUs increases rapidly, slow-moving products tend to accumulate more easily, and trade-offs become more difficult. In this context, concepts such as dormant inventory, dead stock, or reserve inventory become more meaningful for accurately assessing the situation on the ground.
Why does inventory visibility quickly become essential?
Understanding the different types of inventory is the first step. But very quickly, the real issue becomes transparency. As the business grows, the question is no longer just about how much inventory is left, but about which inventory is actually available for use, where it is located, and what it has already been allocated to.
When Manual Files Reach Their Limits
At first, a single file may be enough to track a few SKUs. But as soon as orders increase, returns are added, or multiple people are working on the same data, reliability declines. It’s not always clear whether the figure shown corresponds to the theoretical inventory, the actual counted inventory, or the inventory that’s actually available for sale.
Why Inventory Tracking Becomes More Complex When There Are Multiple Channels
In an omnichannel environment, inventory does not move at the same pace everywhere. A marketplace, an e-commerce site, a physical store, or an outsourced site do not use inventory data in the same way. It is therefore necessary to distinguish between the quantity on hand, the reserved quantity, and the available inventory.
What a tool helps make clearer
Un bon logiciel stock n’apporte pas seulement un chiffre plus propre. Il aide à distinguer les différentes lectures du stock, à suivre les mouvements, à fiabiliser les écarts et à rendre les données exploitables au quotidien. Dans un contexte WMS e-commerce ou OMS e-commerce, cette clarté devient décisive.
How can you make your inventory more transparent and reliable with Shippingbo?
When inventory flows become more complex, it’s no longer just a matter of having accurate inventory levels on paper. You need to quickly understand which inventory is available, which is reserved, which is moving between multiple sites, and how the various channels interpret this reality.
It is in this type of context that inventory tracking must become more reliable without adding to the teams’ daily workload. The transition to a new tool is not primarily about sophistication; it is about meeting a need for operational clarity.
A unified view of inventory across all channels
Shippingbo aide les e-commerçants et les équipes logistiques à centraliser gestion de stocks dans un environnement omnicanal. Cela permet de limiter les lectures partielles entre boutique en ligne, marketplaces et opérations terrain.
A Better Understanding of Available Inventory
Between physical inventory, reservations, pending orders, and logistics movements, inventory data can quickly become difficult to interpret. Shippingbo helps make this data easier to understand so you can better identify what’s truly actionable on a day-to-day basis.
A solution designed to address e-commerce logistics challenges
Shippingbo was designed for e-commerce operations that need to coordinate order orchestration, warehouse fulfillment, and shipping within a single environment. The goal is to make workflows more reliable, inventory more transparent, and operations more seamless as the business grows.
A better understanding of your inventory means a better understanding of your logistics
Understanding the different types of inventory allows for a more nuanced understanding of what is actually happening within a logistics organization. This is what helps distinguish a safety stock from an alert threshold, current inventory from sellable inventory, or slow-moving inventory from excess inventory.
As soon as an e-commerce business grows, becomes omnichannel, or expands its product offerings, this insight becomes essential. Shippingbo helps make inventory data clearer, more reliable, and more actionable on a daily basis by connecting the on-the-ground reality of the warehouse with the promises made on sales channels.
Download our white paper, “5 Tips for Avoiding Inventory Errors,” to identify the most common pitfalls and make your daily inventory readings more reliable.
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FAQ
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Answer: There are several types of inventory because they do not all serve the same purpose. Some are used to anticipate an increase in demand, others to compensate for a delay in supply, to distinguish what is actually available, or to account for the nature of the products in stock.
Answer: The most common types of inventory are safety stock, alert stock, minimum stock, maximum stock, seasonal stock, stock in transit, dormant stock, perishable stock, physical stock, and available stock.
Answer: Physical inventory refers to the quantity actually present in the warehouse. Available inventory refers to the quantity that can still be sold or allocated, after taking into account reservations and pending transactions.
Answer: Safety stock is a buffer intended to absorb unforeseen events. Alert stock is the threshold that signals the need to initiate a reorder before this buffer is depleted.
Answer: The more channels, warehouses, or marketplaces a company uses to sell its products, the harder it becomes to know what is actually in stock. Good visibility reduces errors, out-of-stock situations, and discrepancies between actual inventory levels and the data displayed.
Glossary
Best Before / Use By
The date indicating how long a product will retain its optimal quality. This is important for certain food products or sensitive items.
Lot
A group of units of the same product grouped under a single manufacturing or receiving reference number.
WHO E-commerce
Order management tool. It centralizes orders from multiple channels and helps coordinate them.
Omnichannel
An organizational model in which a company sells through multiple interconnected channels, offering a more unified customer experience.
SKU
Internal code used to uniquely identify a product SKU.
Excess inventory
Inventory levels are too high relative to actual demand, tying up space and cash.
Overselling
A situation in which a product is sold even though it is no longer actually available.
E-commerce WMS
Warehouse management tool. It helps organize on-site operations such as receiving, putaway, picking, and order fulfillment.