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Vertical Lift Module or Cube Storage System? A Guide to Choosing in an Increasingly Uncertain Market

30.06.2026

In recent years, warehouse automation has become a priority for many industrial, logistics, and distribution companies. The growth of SKUs, pressure on delivery times, lack of space, and the need to make picking operations more efficient have led many businesses to evaluate increasingly advanced automated storage solutions.

Among the most widespread technologies are two very different models: automated cube storage systems and Vertical Lift Modules.

Both are designed to optimize space, increase productivity, and reduce manual activities. However, they address different operational needs. Cube systems focus on very high storage density in compact layouts. Vertical Lift Modules, on the other hand, prioritize direct access, predictable times, flexibility, and the ability to adapt to changing contexts.

The question, therefore, is not which technology is better in absolute terms. The right question is: which system is best suited to my warehouse, my flows, and the level of uncertainty I need to manage?

Uncertainty Has Become a Logistics Variable

For a long time, designing a warehouse mainly meant answering one question: how much space can I recover?

Today, this question remains important, but it is no longer enough. In today’s commerce and industry, the real issue is not only the floor area occupied. It is the warehouse’s ability to react when conditions change.

Demand can grow suddenly. A slow-moving component can become urgent in order to avoid a line stoppage. An item that has remained marginal for months can become central again within a few hours. A promotion, a social media trend, a supply delay, or an unexpected customer request can change operational priorities without warning.

In this scenario, the decisive question becomes:

How quickly can I access any item, even the least requested one, when it suddenly becomes critical?

This is where the differences between an automated cube storage system and a Vertical Lift Module become particularly relevant.

Automated Cube Storage Systems: How They Work and When They Are Effective

Cube storage systems are based on a compact grid in which bins are stacked vertically. Robots move across the top of the structure and retrieve bins from above, bringing them to picking bays or workstations.

This architecture makes it possible to eliminate many traditional aisles and concentrate a large number of bins in a reduced floor area. For this reason, cube systems are often chosen for projects where storage density on the floor is the main constraint.

The Main Advantages of Cube Systems

A cube system can be a very effective solution when the warehouse has certain specific characteristics:

• high handling volumes;
• items compatible with standardized bins;
• relatively stable or predictable demand;
• repetitive flows;
• the need to concentrate many bins in a compact area;
• a layout specifically designed around the technology.

In these contexts, the system can optimize itself over time. The most frequently requested items are progressively positioned in more accessible areas, improving operational performance.

The Operational Limit: Speed Can Depend on Position

The logic of cube systems includes one element that must be assessed carefully. Since bins are stacked, reaching an item located deep in the grid may require other bins to be moved. This phenomenon is often referred to as digging.

Under stable conditions, the system is able to compensate for this through optimization algorithms. But if demand changes rapidly, a slow-moving item can become urgent before the system has had time to reorganize positions.

In these cases, the following may increase:

• intermediate movements;
• access times;
• robot congestion;
• performance variability.

The system continues to work, but real speed can become less predictable. And in a production or logistics context, predictability is often just as important as peak speed.

Vertical Lift Module: Direct Access and More Predictable Times

The Vertical Lift Module (VLM) is based on a different logic. Instead of developing across a compact horizontal grid, it uses the available height of the building and automatically moves trays toward the operator bay.

The principle is goods-to-person: the operator does not search for the material; the system brings the material to the operator.

This logic reduces walking, improves ergonomics, increases safety, and makes material management more orderly.

The Advantage of Direct Access

In VLM, each tray can be called by the system without having to move other intermediate bins. This means that access to items is more direct and less dependent on historical picking frequency.

An item moved every day and an item requested for the first time after months can be retrieved through a stable and repeatable operating logic.

This aspect is particularly important in contexts such as:

• industrial production;
• spare parts management;
• MRO and maintenance;
• components;
• tools;
• internal logistics;
• warehouses with heterogeneous SKUs;
• environments with frequent urgencies.

When response time is critical, direct access becomes a concrete advantage.

Performance Predictability: An Often-Underestimated Factor

When comparing warehouse automation technologies, the focus often tends to be only on the declared maximum speed. But in real operations, another parameter also matters: performance consistency.

A system that is very fast under ideal conditions can become less efficient if demand changes, if urgent items are in less accessible positions, or if the operational flow moves away from expected scenarios.

Cube Systems and Performance Linked to History

In cube systems, efficiency depends partly on the software’s ability to position the most requested items in the most accessible areas. This works well when historical data is reliable and demand follows predictable patterns.

However, when the scenario changes, the system may need time to adapt. Performance depends not only on the technology, but also on how items are distributed within the grid.

Vertical Warehouses and More Stable Access Times

In VLMs, access to the tray is less influenced by the item’s »history.« The position can be optimized by the software, but the system does not have to dig through stacked bins to reach the required material.

This makes access times more:

• predictable;
• repeatable;
• independent of ABC curves;
• suitable for managing urgent needs.

In a world where uncertainty has become normal, predictability can represent a strategic advantage.

Storage Density: Floor Area or Volume?

Density is one of the most commonly used criteria for comparing a cube system and a VLM. However, talking only about square meters can be reductive.

The real question is: how much of the building’s volume is actually being used?

The Density of Cube Systems

Cube systems offer high density on the floor. By eliminating aisles and stacking bins, they make it possible to concentrate many items in a compact area.

This characteristic makes them particularly interesting when available height is limited or when the warehouse is designed to manage large volumes of standard bins.

The Volumetric Density of Vertical Lift Modules

VLMs, on the other hand, use the height of the building. This makes it possible to recover floor space and use part of the volume that often remains unused in traditional warehouses.

In the case of Modula VLMs, the use of height makes it possible to free up to 90% of floor space, improving the production layout and making new areas available for higher-value activities.

Another distinctive element is the dynamic management of load heights. The system measures the actual dimensions of the materials and optimizes the space between trays, avoiding wasted volume. In this way, the trays are not constrained to fixed heights, but are organized according to the products stored.

The result is more efficient management of items with different sizes, shapes, and turnover rates.

Flexibility in SKU Management

Another decisive factor is the variety of items.

Cube systems work best when items are stored in standardized bins and when the operational flow is homogeneous. They are therefore very effective in contexts with products that are similar in format and handling logic.

Vertical Lift Modules, on the other hand, offer greater flexibility in managing heterogeneous SKUs. They can accommodate materials of different sizes, technical components, spare parts, small parts, tools, finished products, or semi-finished products.

This flexibility is useful when:

• the assortment changes over time;
• items have very different turnover rates;
• the warehouse serves multiple departments;
• small, medium, and bulky materials coexist;
• order, traceability, and control must be maintained.

For many industrial companies, this ability to adapt is more important than theoretical density alone.

Implementation: Timing, Structure, and Operational Impact

Every automation project must also be assessed based on the time required to make it operational.

Cube Systems: Structured Projects and Dedicated Layouts

A cube system normally requires careful layout design, an assessment of the building’s characteristics, and a specific configuration of the installation. It is a powerful solution, but often more suitable for logistics projects built around the technology.

This is not a limitation in itself, but it is a factor to consider when the company needs a quick solution or must intervene in a site that is already operational.

Vertical Warehouses: Faster Installation and Retrofit

Vertical Lift Modules can be more easily inserted into existing buildings. They are suitable for retrofit projects, progressive expansions, and installations within already active production departments.

The structural impact is generally more limited, because the system develops vertically and does not require an extensive grid over a large floor area.

In the case of Modula, the plug-and-play approach makes implementation even simpler: the system can be installed, configured, and integrated with company software quickly, reducing interference with daily activities.

The operator console and intuitive interfaces also help simplify system use, reducing staff training times and accelerating the transition to full operation.

Software, WMS, and Material Control

Warehouse automation is not only about physical handling. It is also about the digital management of data.

Both cube systems and vertical warehouses can integrate with ERP, WMS, and warehouse management software. The difference lies in the way the software supports operational logic.

In cube systems, software is essential for coordinating robots, optimizing positions, and reducing access times to bins.

In VLMs, software makes it possible to manage inventory, traceability, picking lists, priorities, users, permissions, and integration with company flows. In addition, analysis of picking data can help optimize tray positions over time, bringing the most frequently used ones closer to the bay.

With Modula, integration with company information systems enables more controlled management of materials, orders, and stock, supporting more precise and measurable logistics.

Investment and Scalability

The cost of an automated system should not be assessed only in terms of initial investment. Start-up times, integration, maintenance, future flexibility, and project risk must also be considered.

Cube Systems: Investments Geared Toward Large Volumes (H3)

Cube systems can require significant investments, especially in complex projects and warehouses with large volumes. They are particularly interesting solutions when the company has well-defined needs, consolidated flows, and a strong requirement for density on the floor.

Vertical Warehouses: Modularity and Progressive Growth

VLMs offer more progressive scalability. The company can start with a single unit and expand the system over time, based on volume growth, SKU increase, or process evolution.

This modularity reduces investment risk and makes automation accessible even to organizations that do not want to immediately take on a complex large-scale project.

For many companies, this approach represents a more sustainable way to begin an automation journey.

Comparison Table: Cube System vs. Vertical Lift Module

When to Choose an Automated Cube Storage System

A cube system can be the right choice when the warehouse has very high flows, standardized products, and fairly predictable demand.

It is particularly suitable when:

• the main priority is density on the floor;
• the products are compatible with standard bins;
• the layout can be designed around the grid;
• the volumes justify a structured investment;
• demand follows relatively stable patterns;
• the goal is to manage large quantities of bins in a compact way.

In these cases, the cube system can offer excellent performance and a high level of automation.

When to Choose a Vertical Lift Module

The VLM is more suitable when the company needs to manage variability, urgencies, and heterogeneous items.

It is a particularly effective solution when:

• floor space is limited;
• the building has available height;
• SKUs are numerous and different from one another;
• access times must be predictable;
• urgent needs, line stoppages, or sudden requests are frequent;
• an existing warehouse needs to be automated;
• ergonomics and safety need to be improved;
• the investment must be modular;
• the system needs to grow over time.

In these scenarios, the combination of direct access, flexibility, and rapid implementation makes the vertical warehouse a highly competitive solution.

Why Choose a Modula Vertical Warehouse

After comparing the two technologies, one key point emerges: the choice should not be based only on maximum theoretical density, but on the system’s ability to reduce operational risk.

In a stable, predictable, and very high-volume context, a cube system can be extremely effective. But when the company needs to manage uncertainty, variable SKUs, production urgencies, existing spaces, and the need to scale over time, the Modula VLM offers a particularly solid balance.

Modula makes it possible to:

• recover up to 90% of floor space;
• use the available height of the building;
• access materials quickly;
• reduce picking times;
• improve ergonomics and safety;
• manage heterogeneous items;
• integrate the warehouse with ERP and WMS;
• control inventory and traceability;
• start with a single unit and scale over time;
• reduce the structural impact of automation.

Modula’s strength is not only technological. It is strategic. It enables companies to build a warehouse that is more orderly, more controlled, and better able to respond to change.

Conclusion: Choosing the Technology That Reduces Uncertainty

The comparison between automated cube storage systems and Vertical Lift Modules is not a challenge between one right technology and one wrong technology. It is a matter of context.

Cube systems excel where volumes are very high, demand is predictable, and density on the floor is the main constraint.

Vertical Lift Modules excel where direct access, predictable times, flexibility, rapid implementation, and the ability to manage uncertainty are required.

In a market where emergencies are no longer exceptional events, but part of daily operations, the value of an automated warehouse is not measured only in square meters saved. It is measured in the ability to respond immediately, reduce errors, protect productivity, and maintain control.

For this reason, the Modula VLM represents a recommended solution for companies that want to optimize space, improve picking, and transform the warehouse into a more flexible, scalable, and resilient infrastructure.