Decoding Backpack Volume: Don’t Be Fooled by the Numbers

Who said size doesn’t matter? Backpack volume is a crucial factor when choosing your gear companion, but navigating the world of litres can get confusing. While most major brands follow an industry standard that focuses on closed compartments, some manufacturers include open pockets like water bottle holders in their volume. This inconsistency can make comparing backpacks based solely on listed litres misleading.

How Backpack Volume is Measured

Most major backpack manufacturers measure the volume of their backpacks by adding up the total volume of the ‘closed’ storage compartments. This includes:

• The main compartment
• Pockets
• Hip belt pockets that can be closed or zippered shut

However, many smaller manufacturers use a different method. They often include ‘open’ pockets, such as side water bottle pockets or rear mesh pockets, in addition to the closed storage. This can make weight-to-volume comparisons a little misleading when comparing packs from different manufacturers.

Tips to Crack the Backpack Volume Code

1. Look Beyond the Label: Don’t rely solely on the listed volume. User reviews that mention real-world capacity can be a goldmine of information.
2. Contact the Brand: If you’re unsure about a specific backpack, reach out to the manufacturer and ask them to clarify their measurement method.
3. Focus on Functionality: Think about what you’ll be carrying and prioritise features that suit your needs. A well-designed pack with slightly less listed volume might be perfect for you if it utilises space efficiently.

Detailed Process

1. Closed Storage: Major manufacturers measure the volume of all compartments that can be closed or zipped shut.
2. Including Open Pockets: Some manufacturers include the volume of open pockets, which can lead to higher volume measurements.

Considerations

• Variations Between Brands: Differences in measurement methods can make comparisons tricky. Two backpacks with the same listed volume might not hold the same amount of gear if one includes open pockets in its volume measurement.
• Manufacturer Contact: If unsure about a backpack’s volume measurement method, it’s a good idea to contact the manufacturer directly for clarification.

Why Litres?

Litres are used as a standard unit of measurement for backpack volume because they provide a consistent and easily comparable metric. Unlike cubic inches, litres are widely understood and offer a clear indication of capacity.

Choosing the Right Backpack Volume

When choosing a backpack, it’s essential to consider the duration of your trips and the amount of gear you’ll need to carry. Here’s a general guideline for backpack volumes based on different types of trips:

Day Pack (Half to Full Day Hikes)

• Ideal Volume: 1.5-30 litres (15-30 for hiking)
• Ideal load range: 1-15kg
• Purpose: Designed for short hikes or day trips, biking, running, climbing and snowports.
• Capacity: Enough to carry essentials such as water, snacks, a light jacket, a first-aid kit, and possibly a camera or small personal items.

For half-day hikes with minimal gear, a smaller pack (1.5-20L) might suffice. For all-day adventures or winter hikes, consider a larger pack (25-35L) to comfortably carry extra layers, food, and water. If you plan on carrying a heavier load (over 6.8 kilograms), a pack with a hip belt is recommended for better weight distribution.

Overnight Backpacks (1-3 Days)

• Ideal Volume: 30-50 litres
• Ideal load range: 7-18kg
• Purpose: Suitable for overnight trips or weekend getaways, biking, thru hiking, climbing and showsports.
• Capacity: Can accommodate a sleeping bag, extra clothing, food, water, a cooking kit, and other personal items.

Weekend backpacks bridge the gap between day packs and larger backpacking options. They provide enough space for overnight gear and a change of clothes. A 40L pack is a good minimum size, but if you plan on bringing bulkier items like a sleeping bag or camp chair, opt for a 45-50L pack.

Multi-Day Backpacks (3-7 Days)

• Ideal Volume: 50-70 litres
• Ideal load range: 11-27kg
• Purpose: Designed for extended hikes or camping trips lasting a week, guiding and thru hiking.
• Capacity: Comfortably carries a tent, sleeping bag, cooking gear, ample food and water, extra clothing, and additional essentials like camp stoves or specialised equipment.

Weeklong adventures necessitate a backpack capable of hauling all your camping gear. A 55L pack is suitable for minimalists or those with lightweight gear. Most backpackers will find a 60-65L pack offers a good balance between comfort and capacity. If you plan on bringing a lot of gear or bulky items like bear canisters, consider a 70L pack.

Expedition Backpacks (Extended Adventures)

• Ideal Volume: 70 litres and above
• Ideal load range: 18-36kg
• Purpose: Designed for long-distance journeys exceeding a week, guiding and expedition.
• Capacity: Comfortably carries all your camping essentials, including a tent, sleeping bag, sleeping pad, clothing for various climates, a robust cooking kit, ample food for extended trips, and potential emergency supplies.

Choosing the Right Expedition Pack: Beyond Size

While size is an important factor, there are other crucial considerations when selecting an expedition backpack:

• Durability: These packs will likely carry heavier loads and face harsher conditions. Look for high-quality, robust materials and construction.
• Load-Bearing System: Comfort is paramount on multi-day adventures. Consider features like padded shoulder straps, a supportive hip belt, and an adjustable torso length for optimal weight distribution.
• Organisation: Multiple compartments and internal organisation will help you keep your gear sorted and readily accessible.
• Weatherproofing: Opt for a backpack with a built-in rain cover or one constructed with water-resistant materials to protect your gear from the elements.

Internal Frame vs. External Frame: A Consideration for Expedition Backpacks

• Internal Frame: These backpacks have a supportive frame built into the inside of the pack. They offer a close and comfortable fit, ideal for maneuvering through challenging terrain.
• External Frame: These backpacks have a frame that sits outside the main compartment of the pack. They can be good for ventilation and offer more space for lashing on bulky gear outside the pack. However, the external frame can shift the center of gravity away from your back, potentially causing discomfort on long hikes.

Ultimately, the choice between an internal or external frame backpack for expeditions depends on your personal preferences and the specific demands of your trip. Consider factors like the weight you’ll be carrying, the terrain you’ll be traversing, and your comfort priorities.

Considerations for Guided Expeditions

If you’re participating in a professionally guided expedition, it’s often recommended to consult with your guide regarding backpack recommendations. Many guide services also offer gear rental options, allowing you to avoid a significant purchase for a single use.

External Attachments: Gear Up Without Sizing Up

External attachments offer a clever solution for carrying bulky gear without sacrificing valuable internal space in your backpack. This lets you potentially use the same pack for various trips, from weekend adventures to extended expeditions.

Benefits of External Attachments

• Tame Bulky Gear: Sleeping pads, tents, rain gear, snowshoes – these bulky items often gobble up precious space inside your backpack. External attachments like straps, loops, and mesh pockets allow you to secure them outside, freeing up internal space for essentials.
• Versatility for Different Trips: By utilising external attachments, you can potentially use a single backpack for both short and longer trips. This eliminates the need to purchase a separate backpack for each adventure, especially if your additional gear is bulky but not super heavy.
• Potential for a Smaller Pack: In some cases, external attachments can allow you to use a slightly smaller backpack for a longer trip. This can be ideal for those who value a minimalist approach.

Keep in Mind

• Weight Distribution is Key: Attaching heavy gear externally can shift the backpack’s center of gravity, making it feel less comfortable and potentially causing back strain. Ensure heavier items are still carried close to your back for optimal weight distribution.
• Accessibility Matters: Items attached externally might be less accessible than those stored inside the backpack. Consider how often you’ll need the attached gear and plan accordingly.
• Weatherproofing Considerations: Externally attached gear is more exposed to the elements. Use waterproof gear bags or rain covers for delicate items to keep them protected from rain, snow, or dust.

External attachments are a valuable tool for backpackers. They offer increased gear-carrying capacity and versatility. However, it’s important to use them strategically, considering weight distribution, accessibility, and weather protection. In some cases, a slightly larger backpack might be a better option for longer trips, especially if the extra gear is both bulky and heavy. Ultimately, the best approach depends on your individual needs and preferences. Experiment with different packing configurations and external attachment options to find what works best for your next adventure.

Choosing the right backpack

Choosing the right backpack is essential for a comfortable and successful adventure. Understanding how backpack volume is measured and considering your specific needs and trip duration will help you make an informed decision. Be mindful of variations in measurement methods across different brands and prioritise functionality over listed volume. Utilise user reviews, contact manufacturers for clarification, and focus on the design and features that best suit your activities. Remember, a well-designed backpack that efficiently utilises space can often be more valuable than one with a higher listed volume.

Whether you’re planning a short day hike, a weekend getaway, a weeklong trek, or an extended expedition, selecting the right backpack volume and features is crucial. Embrace external attachments for added versatility, but ensure proper weight distribution and weather protection. By considering these factors and your packing style, you’ll find a backpack that enhances your outdoor experiences and becomes a reliable companion on all your adventures.

Read more at the following links:

• Choosing the right ultralight pack
• Choosing the right day pack
• Choosing the right overnight pack