Sustainment Packs: What They Are and How to Use Them

When you're heading into the field for an extended mission or a multi-day trek, the gear you carry can make or break your success. While assault packs are designed for short, high-intensity operations, sustainment packs are built for endurance, carrying the essentials you need to survive and operate over several days. But what exactly defines a sustainment pack, and how do you use one effectively?

In this guide, we'll break down the sustainment pack definition, explore their key features, and show you how to use them for military operations, hunting expeditions, and other demanding activities. We'll also compare sustainment packs to assault packs so you can choose the right pack for your needs.

What Is a Sustainment Pack?

A sustainment pack is a large-capacity backpack designed to carry the supplies and equipment needed to sustain an individual over an extended period, typically 72 hours or more. Unlike assault packs, which prioritize mobility and quick access for combat or tactical operations, sustainment packs focus on storage capacity, organization, and load-bearing comfort for long-duration missions.

Sustainment packs are commonly used by military personnel for extended field operations, but they are also popular among hunters, hikers, and outdoor enthusiasts who need to carry camping gear, food, water, and other essentials for multi-day trips. They typically range from 50 to 100 liters or more, with multiple compartments and attachment points for modular gear.

• Key features of sustainment packs include:
• Large main compartment with multiple access points
• Padded hip belt and shoulder straps for load distribution



• Modular attachment system for pouches and accessories
• Durable, weather-resistant materials
• Compression straps to stabilize the load

Sustainment Pack vs. Assault Pack: What's the Difference?

The primary difference between a sustainment pack and an assault pack lies in their intended use. An assault pack is smaller, typically 20-40 liters, and is designed for short-duration missions where speed and agility are critical. It allows you to carry essential gear like ammunition, water, and communication devices while keeping your hands free and your profile low.

In contrast, a sustainment pack is larger and built for endurance. It can carry additional clothing, food, sleeping gear, and other supplies needed for extended operations. While an assault pack might be used for a day patrol, a sustainment pack is for a multi-day mission where resupply is uncertain. Many military operators use both: an assault pack for immediate needs and a sustainment pack for the long haul.

Key Features to Look for in a Sustainment Pack

When choosing a sustainment pack, consider the following features to ensure it meets your needs. First, capacity: look for a pack with at least 50 liters of space, but consider your specific mission requirements. Second, comfort: a padded hip belt and adjustable shoulder straps are essential for distributing heavy loads. Third, organization: multiple compartments and pockets help you keep gear accessible and organized.

Durability is also crucial. Sustainment packs are often used in harsh environments, so look for materials like high-denier nylon and reinforced stitching. Additionally, modularity is a plus: packs with attachment points allow you to customize your setup with pouches and accessories. For example, you can add a Small General Purpose Pouch to your pack for extra storage, or use a Contour Shoulder Harness to enhance comfort during long marches.

How to Use a Sustainment Pack Effectively

Using a sustainment pack effectively starts with packing smart. Place heavy items like water and food close to your back and centered to maintain balance. Use compression straps to keep the load stable and reduce sway. Organize gear by category: sleep system at the bottom, clothing in the middle, and frequently used items like navigation tools or snacks in top or side pockets.

For military personnel, sustainment packs often integrate with body armor and other tactical gear. Look for packs with a frame that allows airflow between the pack and your back to reduce heat buildup. Additionally, consider using modular accessories to tailor the pack to your mission. For instance, a Recon Chest Pack Harness can be used to carry essential items on your chest for quick access while keeping your sustainment pack for bulkier gear.

Sustainment Packs for Military and Outdoor Use

In military contexts, sustainment packs are essential for extended patrols, reconnaissance missions, and operations where resupply is not guaranteed. They allow soldiers to carry enough food, water, ammunition, and medical supplies to sustain themselves for days. The ability to attach additional pouches and accessories makes them highly adaptable to mission-specific requirements.

Outdoor enthusiasts also benefit from sustainment packs. Hunters, for example, can use them to carry camping gear, game processing tools, and extra layers for multi-day hunts. Hikers and backpackers can use them for extended trips into the backcountry. The key is to choose a pack that fits your body and your specific needs. Eberlestock offers a range of sustainment packs designed for both military and civilian use, ensuring you have the durability and functionality required for any mission.

Whether you're a military operator, a hunter, or an outdoor enthusiast, a sustainment pack is a valuable investment for any extended mission. By understanding what they are, how they differ from assault packs, and how to use them effectively, you can ensure you're prepared for anything. Explore Eberlestock's selection of sustainment packs and related accessories to find the perfect setup for your next adventure.