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High-Density Storage: How to Improve Labor Utilization, Maximize Space and Drive Throughput

High-density storage improves labor utilization, maximizes space and drives throughput by aligning storage design and automation within the existing footprint.

by Dan Avila and TJ Franco

Rethink your storage strategy

Across many distribution centers today, the same challenges continue to surface. Labor is expensive and difficult to find, while storage space is constrained and costly to expand. At the same time, customer expectations have shifted. Faster delivery, higher accuracy and more complex order profiles are now today’s baseline requirements, putting additional pressure on achieving throughput targets. Even with ongoing adjustments to the warehouse layout, there are only small performance gains.

These challenges are often addressed independently, but they are closely connected and trace back to a common issue with how storage is designed and how it supports the operation. There is no single solution that resolves them. Improving performance requires a more integrated approach across storage, automation and workflow.

In this blog, we’ll explore what’s driving these challenges and the key aspects behind high-density storage. We’ll also examine how combining these solutions with goods-to-person picking systems can improve labor utilization, increase storage capacity and support more consistent throughput without expanding the existing footprint.

8 key benefits high-density storage delivers

High-density storage is often evaluated based on space savings alone, but that underestimates its impact. When storage and automation reflect how work moves through the facility, the benefits extend across the entire operation:

  1. Improves space utilization through better use of vertical capacity and reduced aisle space, supporting two to four times more inventory.
  2. Lowers cost per unit stored through more efficient use of infrastructure.
  3. Improves labor efficiency by reducing travel and manual tasks, with goods-to-person systems lowering labor requirements across picking and inventory control.
  4. Supports SKU proliferation without requiring additional storage space, using automated systems that enable flexible bin and tote configurations.
  5. Improves inventory control and accuracy through automated storage that reduces errors and ensures consistent handling.
  6. Energy and sustainability benefits through more efficient use of space and resources.
  7. Improves throughput in constrained sites by reducing congestion and optimizing flow.
  8. Enhances safety by limiting lift truck traffic, a leading source of warehouse accidents.
High-density storage benefits:
  • Improves space utilization
  • Lowers cost per unit stored
  • Improves labor efficiency
  • Supports SKU proliferation
  • Improves inventory management
  • ESG benefits
  • Improves throughput
  • Enhances safety
Supply Chain Digital Twin Technology used in a modern Logistics Warehouse

Rethinking the storage problem

Most operations that appear constrained are not limited by the amount of space, but by how that space is being used. In many cases, the footprint is sufficient, but the configuration limits performance. These show up as:

  • Warehouse layouts that no longer reflect current demand
  • Storage racking configurations that don’t align with SKU velocity
  • Excessive travel during picking and replenishment
  • Fragmented inventory locations that complicate execution

In this environment, adding more storage or installing additional racking adds complexity without addressing the underlying issue. High-density storage shifts the focus to how space is utilized. By reducing wasted aisle space, leveraging vertical capacity and aligning storage with inventory flow, the existing footprint becomes more productive and capable of supporting growth.

How to improve labor utilization

Labor is one of the largest cost drivers, but the real opportunity is to remove inefficiencies that consume time and resources. Much of that effort is spent on activities that slow execution, including:

  • Unnecessary travel during order picking
  • Congestion at key locations
  • Reactive replenishment
  • Repeated handling of the same product

These are issues connected to storage design and layout. High-density storage, combined with automation and goods-to-person systems, addresses them directly by reducing travel and minimizing manual handling.

Inventory is positioned closer to demand, picking areas are more structured and replenishment becomes more predictable. The result is a more stable operation where effort is focused on productive work rather than compensating for inefficiencies.

Increase storage capacity without expanding the footprint

When distribution centers reach capacity, the typical response is expansion or the use of overflow space. Both add cost and complexity.

High-density storage provides a more effective approach by increasing capacity within the existing footprint. By leveraging vertical space and reducing aisle requirements, operations can support higher inventory volumes in the same facility.

This reduces reliance on off-site storage, delays capital investment and creates flexibility to add SKU growth. As product portfolios expand, making better use of existing space becomes a competitive advantage.

Improving throughput by aligning storage and flow

Throughput challenges can persist even when labor and storage appear sufficient. Orders move slower than expected, and bottlenecks continue to show up in the same areas.

Often, the issue is how storage and automation interact with daily execution. When they are not designed around actual workflow, excess travel and congestion increase, leading to inconsistent throughput.

Automated high-density storage systems change this by reducing manual labor, limiting congestion and supporting more consistent execution.

  • At the pallet level, solutions such as pallet racking systems, push-back racking, pallet flow, mobile racking and automated storage and retrieval systems provide various levels of density and access to inventory.
  • In carton and case operations, carton flow, mobile aisle shelving, mini-load AS/RS, shuttle systems and high-mast AMRs reduce travel and support a more compact layout.
  • For each picking, goods-to-person systems deliver inventory directly to the operator, significantly reducing travel and improving order execution and accuracy.

The key is selecting the right approach that fits how the operation runs day to day. When storage and automation are designed together, throughput becomes more consistent and better equipped to handle increased demand.

AutoStore high-density, high-throughput storage solution

Storage design is critical to inventory management

Storage design directly impacts how effectively inventory is managed. When storage lacks structure, it shows up quickly in execution. Replenishment becomes inconsistent, inventory is harder to locate and error rates increase. Cycle counting requires more time and resources, and visibility is more difficult to maintain.

High-density storage introduces a more organized and controlled environment. Product locations are clearly defined, making inventory easier to track and manage. As operations grow in complexity, this level of structure becomes critical to maintaining accuracy and supporting consistent service levels.

Understanding three key trade-offs with high-density storage

High-density storage introduces three important trade-offs that should be evaluated as part of the design process. These decisions shape how the operation performs over time.

  1. Density vs. accessibility: Increasing density improves space utilization but can limit access, especially in deep-lane or highly compact systems.
  2. Capital investment vs. operational savings: Higher upfront investment can be offset by long-term gains in labor reduction, improved throughput and enhanced safety.
  3. Inventory profile: The solution must match product characteristics, velocity and handling requirements, with automation focused on fast- and medium-moving inventory.

Many high-density technologies are designed for specific applications. Choosing the wrong approach can introduce new constraints, even if density improves. The goal is to balance efficiency, access and performance for long-term success.

High-density trade-offs:
  • Density vs. accessibility
  • Investment vs. savings
  • Inventory profile

Evaluating high-density storage cost

Cost is often the starting point for evaluating storage decisions, but it should not be the only factor. A more comprehensive view considers how performance changes over time:

  • Reduced labor associated with travel and handling
  • Improved throughput and productivity
  • Lowered reliance on overflow storage
  • Delayed or avoided facility expansion

It also includes the impact on cost per unit stored as the system grows. When evaluated together, these factors connect investment decisions to performance outcomes.

A structured approach drives better outcomes

High-density storage initiatives are most effective when guided by a structured, data-driven methodology that evaluates the operation as an integrated system. This approach includes:

  1. Collecting and analyzing historical data.
  2. Developing concept hypotheses.
  3. Designing layouts and implementing plans.
  4. Funding and commencing implementation.
  5. Evaluating concepts.
  6. Developing the business case.

This helps organizations identify the right-fit technology and avoid over- or under-engineering for their system.

Where high-density storage is delivering value

High-density storage is being applied across several industries, each with different requirements but similar challenges. Examples include:

Food and beverage: High-mast AMR systems to support mixed-case handling of both heavy beverage cases and lighter snack products. In high-volume environments, they also enable multi-temperature storage and integrate pallets, cases and each picking within a single workflow.

Automotive: Each-pick replenishment system manages high SKU counts, high volumes and heavier parts, supporting consistent fulfillment across large distribution networks.

Healthcare: Automated storage solutions support multi-temperature environments, combining ambient and refrigerated storage with integrated sortation.

Grocery: High-mast AMR case-handling systems enable aisle-based replenishment, mixed-case processing, pallet breakdown and build and delivery of cases based on real-time demand.

Apparel and footwear: Goods-to-person systems support high SKU counts and e-Commerce fulfillment, while improving returns processing by quickly reintegrating inventory back to sellable stock and reducing delays associated with manual handling.

Across these applications, organizations are focused on:

  • Maximizing storage within the existing footprint
  • Improving labor utilization
  • Increasing throughput
  • Strengthening inventory management
High-density storage delivers value:
  • Maximizes storage
  • Improves labor utilization
  • Increases throughput
  • Strengthens inventory management

Storage design as an operational advantage

High-density storage is often positioned to increase capacity, but the real impact is how it improves overall performance. When storage reflects how products and materials flow through the facility, organizations see clear improvements:

  • More effective use of available space
  • Higher productivity
  • More consistent throughput
  • Lower costs over time

The difference is not the technology itself, but how well it fits the environment it’s expected to support. Storage design should be treated as a core business decision. When it reflects operational requirements, it becomes the foundation for sustained performance.

FORTNA Can Help

FORTNA takes a consultative approach, partnering with organizations to understand their operations and business objectives. As a system integrator, we deliver engineered, data-driven solutions that bring together storage and automation. Using proprietary tools and a structured methodology, we evaluate options, build business cases and identify right-fit technologies to improve performance.

Evaluate Your Storage Strategy

About the authors

Dan Avila, Vice President Sales

Dan has over 30 years of industry experience in supply chain consulting and sales. His varied background in sales and sales management includes large-scale material handling automation, WMS (warehouse management system), WES (warehouse execution system), WCS (warehouse control system), and other products and services.

 

TJ Franco, Sales Director

TJ is a seasoned supply chain professional with over 15 years of experience in roles varying from production and sourcing, to importing and omnichannel distribution. TJ is a CSSC Lean Six Sigma Yellow Belt and a member of CSCMP and the Procurement Foundry.

 

Dan Avila VP Sales at FORTNA

 

TJ Franco, Sales Director at FORTNA