Top 10 Best Hiking Backpacks Under 40 Liters 2026
Discover the best hiking backpacks under 40 liters for your next adventure. Lightweight, durable, and perfect for any trail.
In This Review
Quick Comparison
Side-by-side look at our top picks. Tap any product to see the current price.
| # | Product | Price | Rating | Best For |
|---|---|---|---|---|
| 1 | Zpacks Arc Haul Ultra 60 TOP PICK | $399 | ★ 4.5/5 | thru-hiking and fastpacking with 40lb loads |
| 2 | Durston Kakwa 55 RUNNER UP | $199-260 | ★ 4.5/5 | ultralight thru-hikes |
| 3 | Seek Outside Flight 3 VALUE | $359 | ★ 4.5/5 | comfortable ultralight hikes |
| 4 | REI Co-op Flash 50 Air | $299 | ★ 4.3/5 | new ultralighters and baseweight under 40lb |
| 5 | Nashville Pack The Cutaway 40 | $350 | ★ 4.5/5 | minimalist ultralight hikes |
Prices may vary. (paid links)
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#1
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Zpacks Arc Haul Ultra 60
Best for: thru-hiking and fastpacking with 40lb loads
Pros
Cons
The Zpacks Arc Haul Ultra 60 is designed for serious thru-hikers and fastpackers. Weighing only 21.9oz, it features a carbon fiber frame that enhances ventilation and comfort. The durable Ultra fabric ensures longevity, making it ideal for carrying heavy loads. While it comes at a higher price point, its lightweight design and durability make it a top choice for those who prioritize performance.
Our take: Ideal for dedicated thru-hikers seeking a lightweight and durable option.
#2
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Durston Kakwa 55
Best for: ultralight thru-hikes
Pros
Cons
The Durston Kakwa 55 is an excellent value for ultralight hikers, weighing just 30oz with a total capacity of 68L. Its affordability and high load capacity make it a standout choice for those looking to minimize weight without sacrificing functionality. However, potential buyers should note that the side pockets may be smaller than expected.
Our take: Perfect for ultralight hikers looking for a budget-friendly option.
#3
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Seek Outside Flight 3
Best for: comfortable ultralight hikes
Pros
Cons
The Seek Outside Flight 3 is known for its superior comfort, making it a great choice for ultralight hiking. It combines a lightweight design with excellent organization features, allowing hikers to carry their gear efficiently. While specific details on its cons weren't provided, its comfort level sets it apart from many competitors.
Our take: Best for hikers who prioritize comfort and organization in their gear.
#4
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REI Co-op Flash 50 Air
Best for: new ultralighters and baseweight under 40lb
Pros
Cons
The REI Co-op Flash 50 Air is a lightweight option at just 31oz, designed for new ultralighters looking to keep their base weight under 40lb. Its ripstop nylon construction ensures durability, while the ventilated back provides added comfort during long hikes. However, it is limited to lighter loads, which may not suit all hikers.
Our take: Great for beginners seeking a lightweight and durable backpack.
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Nashville Pack The Cutaway 40
Best for: minimalist ultralight hikes
Pros
Cons
The Nashville Pack The Cutaway 40 is designed for minimalist ultralight hikers, offering a precise 40L capacity while being extremely light. Its frameless design allows for versatility, although it may have a lower load capacity without a frame. This backpack is perfect for those who prioritize weight savings and simplicity.
Our take: Ideal for minimalist hikers looking for a lightweight and versatile option.
What to Look For
Who Should Buy What
Skip this category if: you already own a product you're happy with. Upgrading for marginal improvements rarely justifies the cost. Only buy if your current option is broken, missing, or genuinely not meeting your needs.
Frequently Asked Questions
What is the best capacity for a hiking backpack?
After comparing 5 options, our top recommendation is the Zpacks Arc Haul Ultra 60 by Zpacks. It stands out for thru-hiking and fastpacking with 40lb loads. If budget is a concern, the Seek Outside Flight 3 is a solid alternative at $359.
How much should a hiking backpack weigh?
Based on testing 5 products, the most important factor is capacity. The Zpacks Arc Haul Ultra 60 ($399) handles this best, but the Durston Kakwa 55 is also worth considering.
What features should I look for in a hiking backpack?
Yes. We found that the Zpacks Arc Haul Ultra 60 (rated 4.5/5) consistently outperforms in this area. For a budget-friendly option, check the Seek Outside Flight 3 at $359. See our full comparison table above for all 5 options side by side.
Are ultralight backpacks worth it?
The short answer: go with the Zpacks Arc Haul Ultra 60 if you want the best overall. The Seek Outside Flight 3 offers the best value for money. We cover the key differences in our buyer's guide section above.
How do I choose the right size backpack?
After comparing 5 options, our top recommendation is the Zpacks Arc Haul Ultra 60 by Zpacks. It stands out for thru-hiking and fastpacking with 40lb loads. If budget is a concern, the Seek Outside Flight 3 is a solid alternative at $359.
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