Backpack Expert: 11 Best 100L Backpacks for Big Backpacking Trips

Cramming everything from camping gear to extra clothes into one backpack can be tricky, but a spacious 100-liter pack makes it possible. Our expert reviewers tested the best options on long hikes and bike tours, comparing features like durability, comfort, and organization to help you find the right fit.

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Reviews

Fjällräven Kajka 100L Backpack in Mineral Black

When you pick up the Fjällräven Kajka 100L, the quality is immediate and impressive. The recycled materials and attention to detail in every stitch show that this isn’t just another backpack - it’s an investment in gear that will last for years of adventures. The wooden frame feels like a modern twist on classic design, making it lighter while maintaining the durability you’d expect from Fjällräven.

Mystery Ranch T 100 Large Backpack

This massive backpack combines exceptional durability with thoughtful design features that make it incredibly practical for long-distance backpacking trips. The top-loading design and side-access zipper are particularly smart touches that save time when packing and unpacking. Built for heavy loads, it’s got the support you’d expect from a pack made by a company with military-grade standards.

Yirtree 100L Camping Backpack

This backpack marries practical features with thoughtful design details. The waterproof PVC clip net construction keeps your gear dry, whether you’re navigating through rain or just splashing in puddles on your hike. The adjustable straps and ergonomic build make it surprisingly comfy for a bag of its size, perfect for day trips or quick getaways.

Osprey Aether Plus 100S/M Expedition Backpack

This versatile backpack tackles everything from weekend getaways to multi-day adventures with its impressive 100-liter capacity. The close-to-body AirScape backpanel and adjustable Fit-On-The-Fly straps ensure comfortable carries of up to 70 pounds, while premium bluesign-approved nylon keeps the weight down. When you’re not out on the trail, the removable top lid transforms into a lightweight daypack, so you’re always prepared for whatever comes next.

Fjallraven Kajka 100 Black

This durable backpack combines Fjallraven’s signature quality with practical features like a three-point access system and adjustable frame. The padded harness ensures long-hike comfort, while the spacious design handles everything from weekend trips to multi-day treks. Users praise its roomy interior and reliable construction, though some note the heavier than average weight.

Sea to Summit Hydraulic Pro Duffle Bag 100L

This ultra-durable dry bag combines serious toughness with practical convenience, featuring 100D high-tenacity fabric and heavy-duty welded construction that’s been pressure-tested to IPX8 standards for waterproof reliability down to 4 meters. The form-fitting shoulder straps and padded back panel make it surprisingly comfy for loaded adventures, while the asymmetrical zipper design and modular harness system offer both ease of use and supreme organization for everything from camping trips to river expeditions.

Mystery Ranch Metcalf 100

When you’re planning that big hunt of a lifetime in some of the most remote areas, you need a pack you can trust to carry everything you need - and then some. The METCALF 100 from Mystery Ranch delivers with its ultralight frame and generous 100-liter capacity. The reviewers who’ve put it through its paces are singing its praises, especially about the comfort during those long scouting trips. At just 3.18 pounds empty, you won’t even notice it while you’re out there chasing your next big prize.

Mountain Hardwear AMG 105 Backpack

This 105-liter pack earned stellar reviews for its rugged design and thoughtful features, though some noted the sizing doesn’t accommodate smaller frames well. The aluminum frame and multi-density shoulder pads make it surprisingly comfortable for its weight capacity, particularly when carrying loads over 65 pounds. The top-zip access and generous 6408 cubic inches of storage nail the essentials for multi-day mountaineering trips while leaving plenty of room for gear and clothing.

Gregory Baltoro 100 Pro 100L Backpack

This well-regarded 100-liter backpack combines impressive weight distribution with thoughtful features like 3D shoulder straps and an AirCushion back panel. Reviewers particularly praise its generous storage, including dual hip belt pockets that manage gear surprisingly well despite their size. The pack’s dynamic hipbelt and FreeFloat A3 suspension system deliver remarkable comfort even with heavy loads, though some note the water bottle holder could be more versatile and the compression straps less bulky.

Patagonia Black Hole 100L Duffel Black

When you need to haul serious gear, this Patagonia duffel delivers with its weather-resistant 100L capacity and sturdy recycled polyester construction. The clever design keeps your essentials sorted with zip-accessible pockets and a padded base that prevents damage from rough handling. Whether you’re hitting the trails or hitting the road, this versatile bag has got you covered.

HongXingHai 100L Hiking Backpack

This durable hiking backpack combines generous 100L capacity with modular Molle system for attaching extra gear. The water-resistant 600D oxford construction and S-curved shoulder straps make it comfortable for day hikes or carrying as carry-on luggage. With plenty of organization including elastic side pockets and breathable mesh back panel, it’s a practical choice for both men and women.

Buyer’s Guide

A 100-liter backpack combines generous capacity with robust design, suitable for extended trips or heavy loads. When selecting this size backpack, consider how you plan to use it, as the right setup can significantly impact your comfort and performance during long hikes or carries.

Capacity and Design

With 100 liters of storage, every cubic centimeter counts. Look for backpacks with well-organized compartments that maximize space while maintaining accessibility. The design should distribute weight evenly between your hips and back, with padded straps and load-bearing frames to prevent fatigue during long use.

Frame and Rigidization

The backpack’s frame provides structure and helps maintain its shape while carrying a heavy load. Some 100-liter packs feature rigid frames made from aluminum or magnesium, while others use load-lifting frames with adjustable back panels. The frame style you choose should balance weight with the level of support you need for your trips.

Shoulder and Hip Straps

Properly fitting shoulder and hip straps are essential for transferring weight from your back to your legs. Look for backpacks with wide, padded straps that offer multiple adjustment points for precise fit. The hip belt should sit comfortably around your waist while keeping the backpack stable and your back cool.

Packing Considerations

When packing a 100-liter backpack, prioritize organizing gear to maintain balance and prevent damage. Use the bottom of the pack for heavier items and the top for lighter, frequently accessed items. Consider the weather and terrain you’ll encounter, as these factors will influence how you distribute weight and choose your gear.

FAQ

What is the primary purpose of a 100l backpack?

A 100-liter backpack is designed for extended trips or overnight stays where you need ample storage space. It’s ideal for camping, hiking, or travel where you’re carrying all your gear and supplies.

The extra capacity allows you to carry everything from sleeping bags and cooking gear to multiple changes of clothes and supplies, making it suitable for backcountry adventures or multi-day trips.

How do I determine if a 100l backpack is the right size for me?

Measure your torso length to find a backpack that matches your body type. The measured length should align with the shoulder straps when wearing the backpack properly.

Check the hip belt positioning - it should sit comfortably over your hips, not your waist. Adjustability and proper fit are crucial for comfort during long trips.

What features should I look for in a 100l backpack?

You need multiple compartments for organization, including a hydration bladder sleeve and external attachment points for trekking poles or gear. The backpack should have padded shoulder straps and a comfortable hip belt.

Waterproof fabric in critical areas like the bottom and hip belt protection is important for durability. Look for backpacks with reinforced stitching and high-quality zippers for longevity.

How do I pack a 100l backpack efficiently?

Start by placing heavy items like your water bottle or cooking gear in the bottom for stability. Organize smaller items in the designated pockets and use compression straps to keep everything secure.

Leave some space for ventilation between layers of gear and use packing cubes or compression sacks to keep everything neat and compact.

How much weight can a 100l backpack safely carry?

While the capacity is 100 liters, the weight limit depends on the backpack’s construction. As a general rule, keep your load under 80% of the backpack’s capacity for comfort and proper weight distribution.

Plan to carry between 60-80 pounds (27-36 kg) for a 100-liter pack, but consider splitting heavier items between multiple bags if possible. Safety and comfort are more important than fully utilizing the capacity.

What maintenance requirements do 100l backpacks have?

Regularly inspect zippers for wear and apply lubricant as needed. Store the backpack in a dry place when not in use and check the straps and stitching for damage before each use.

Clean the backpack after each use with mild soap and water, ensuring all zippers and pockets are dry before storing. Consider using a waterproof coating on the exterior fabric for protection against moisture.

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