When it comes to tactical backpacks, size matters. Whether you’re sourcing gear for military personnel, law enforcement, or outdoor enthusiasts, understanding how to calculate the size and capacity of a tactical backpack is crucial. Choosing the right size ensures functionality, comfort, and efficiency for the end-user.
In this guide, we’ll break down everything you need to know about tactical backpack sizes, including how to measure dimensions, calculate capacity, and select the right size for different use cases.
Let’s dive in!
Why Size and Capacity Matter in Tactical Backpacks
Tactical backpacks are designed for specific purposes, and their size and capacity play a key role in meeting user needs. A backpack that’s too small won’t hold all the necessary gear, while one that’s too large can be cumbersome and uncomfortable.
For businesses, understanding these factors is essential. It helps you recommend the right products to your customers, whether they’re outfitting a team for a mission or preparing for an outdoor adventure.
How to Measure the Size of a Tactical Backpack
1. Measuring Dimensions
To determine the size of a tactical backpack, you’ll need to measure its dimensions: length, width, and depth. Here’s how to do it:
- Length: Measure from the top of the backpack (near the handle) to the bottom.
- Width: Measure across the widest part of the backpack, typically from side to side.
- Depth: Measure from the front of the backpack to the back.
Use a measuring tape and record the dimensions in inches or centimeters. For example, a backpack might measure 20 inches (length) x 12 inches (width) x 8 inches (depth).
2. Calculating Volume/Capacity
Once you have the dimensions, you can calculate the backpack’s volume, which is often expressed in liters or cubic inches. Here’s the formula:
Volume (in cubic inches) = Length × Width × Depth
To convert cubic inches to liters, divide the result by 61.02 (since 1 liter = 61.02 cubic inches). For example, a backpack measuring 20 x 12 x 8 inches has a volume of 1,920 cubic inches, which is approximately 31.5 liters.
Keep in mind that this is a rough estimate. The actual usable capacity may be less due to compartments, straps, and irregular shapes.
Choosing the Right Size for Different Use Cases
Not all tactical backpacks are created equal. The right size depends on the intended use. Here’s a breakdown of recommended sizes for various applications:
| Use Case | Recommended Capacity | Key Features |
| Military/Combat Use | 30-50 liters | Durable, modular, mission-specific compartments |
| Outdoor Adventures | 20-40 liters (daypacks) | Lightweight, hydration-compatible |
| Law Enforcement/Tactical Operations | 25-40 liters | Quick-access compartments, MOLLE webbing |
| Everyday Carry (EDC) | 10-25 liters | Compact, ergonomic, multiple pockets |
Advanced Capacity Calculation Methods
For irregularly shaped backpacks, manual measurements might not be enough. Here are two advanced methods:
Water Displacement Method
- Fill the backpack with packing peanuts or soft material.
- Pour the contents into a measured container to determine the volume.
- This method is especially useful for backpacks with non-rectangular shapes.
3D Scanning Apps
- Use apps like Scandy Pro or Polycam to create a 3D model of the backpack.
- These tools provide precise measurements and can account for curves and angles.
While these methods are more time-consuming, they offer greater accuracy, especially for custom or uniquely designed backpacks.
Impact of Design Features on Capacity
Not all space in a backpack is usable. Design features can impact how much gear you can actually store. Here’s what to consider:
- MOLLE Webbing: Adds versatility for attaching pouches but reduces internal volume.
- Compression Straps: Allow compact packing but limit expansion when fully loaded.
- Hydration Sleeves: Dedicated space for water bladders reduces gear storage.
- Compartmentalization: Admin panels, radio pockets, and dividers improve organization but divide capacity.
For example, a 40L backpack with multiple compartments might only offer 35L of usable space. Always check the product details or ask the manufacturer for clarification.
Sustainability and Size Efficiency
Sustainability is becoming a priority in tactical gear design, driven by consumer demand and environmental responsibility.
Lightweight, eco-friendly materials like recycled nylon and TPU-coated fabrics are now used to reduce a backpack’s bulk without compromising durability.
For example, a 30L backpack made with Cordura Eco Fabric—a sustainable alternative made from recycled materials—can shave off up to 10% of its weight compared to traditional fabrics.
This reduction not only makes the backpack easier to carry but also maintains the same capacity and performance, ensuring it meets the demands of professionals and outdoor enthusiasts alike.
When sourcing backpacks, ask manufacturers about material certifications (e.g., Bluesign® or Global Recycled Standard). This ensures your products meet both environmental and performance benchmarks.
FAQs
1. How do I convert cubic inches to liters?
Divide the volume in cubic inches by 61.02. For example, 1,920 cubic inches ÷ 61.02 = 31.5 liters.
2. What’s the difference between total capacity and usable capacity?
Manufacturers often label backpacks with their total capacity in liters. However, this number doesn’t always reflect the usable space. Here’s what you need to know:
- Total Capacity: This includes all compartments, pockets, and straps.
- Usable Capacity: This is the space available for storing gear, excluding areas taken up by internal structures.
3. What size backpack is best for a 3-day hiking trip?
A 50-70 liter backpack is typically suitable for a 3-day trip, depending on the amount of gear you need to carry.
4. How do I measure a backpack’s torso length for proper fit?
Measure from the base of the neck (C7 vertebra) to the top of the hips. Match this measurement to the backpack’s torso size range.
5. Can I add external pouches to increase capacity?
Yes, MOLLE-compatible pouches can expand storage, but they add weight and may affect balance.
6. What’s the average lifespan of a tactical backpack?
With proper care, a high-quality tactical backpack can last 5-10 years, depending on usage and maintenance.
Conclusion
Choosing the right size and capacity for a tactical backpack is essential for meeting user needs and ensuring satisfaction.
By understanding how to measure dimensions, calculate volume, and select the appropriate size for different use cases, you can make informed decisions that benefit both your business and your customers.
Customization and Bulk Orders
At LQ ARMY, we specialize in high-quality tactical backpacks designed to meet the demands of professionals and adventurers alike.
Here’s how you can tailor tactical backpacks to meet specific needs:
- Custom Sizes: Adjust dimensions to fit unique gear requirements.
- Extra Compartments: Add admin panels, radio pockets, or hydration sleeves.
Bulk Order Benefits:
- Consistent quality across large quantities.
- Branding opportunities (e.g., adding logos or team insignias).
Need a custom-sized tactical backpack for your team? Contact us today to discuss tailored solutions!
