Front view of the Hyperlite Mountain Gear Unbound 40 in White with durable Dyneema® Stretch Mesh front pocket

Unbound

Rated 4.7 out of 5
Based on 135 reviews

"As an experienced thru hiker, this is the best pack in my collection yet. Kept all my gear dry through the Scottish Highlands, very sturdy and comfortable." — Scott C.

Volume
Torso Length
Color:White
Weight: 28.5 oz
Availability: In stock, ready to ship
$369.00

How to Choose a Pack Size

Your torso length, not your height, determines your pack size. We recommend the following to determine yours:

  1. Tilt your head slightly forward to locate the bony bump at the base of your neck. (This is your 7th cervical (or C7) vertebra).
  2. Using a flexible tape measure, have someone measure starting at that spot and running down along the curve of your spine.
  3. Place your hands on your hips so you can feel your iliac crest, which serves as the “shelf” of your pelvic girdle. (It’s the first hard thing you feel when you run your fingers down from the sides of your ribcage.) Position your hands so your thumbs are reaching behind you.
  4. Have your friend finish measuring at the point where the tape crosses an imaginary line drawn between your thumbs. This distance is your torso length.
    • Small (15.0” - 17.0” torso)
    • Medium (17.0” - 19.0” torso)
    • Large (19.0” - 21.0” torso)
    • Tall (21.0”+ torso)
  5. If your measurement falls right in between sizes (for example, if you have a 17.0” torso, so you are right on the line between a Small and a Medium), we suggest you choose the larger torso size.

WATCH THE VIDEO

How to Choose a Pack Size

How to Choose a Pack Size

Your torso length, not your height, determines your pack size. We recommend the following to determine yours:

  1. Tilt your head slightly forward to locate the bony bump at the base of your neck. (This is your 7th cervical (or C7) vertebra).
  2. Using a flexible tape measure, have someone measure starting at that spot and running down along the curve of your spine.
  3. Place your hands on your hips so you can feel your iliac crest, which serves as the “shelf” of your pelvic girdle. (It’s the first hard thing you feel when you run your fingers down from the sides of your ribcage.) Position your hands so your thumbs are reaching behind you.
  4. Have your friend finish measuring at the point where the tape crosses an imaginary line drawn between your thumbs. This distance is your torso length.
    • Small (15.0” - 17.0” torso)
    • Medium (17.0” - 19.0” torso)
    • Large (19.0” - 21.0” torso)
    • Tall (21.0”+ torso)
  5. If your measurement falls right in between sizes (for example, if you have a 17.0” torso, so you are right on the line between a Small and a Medium), we suggest you choose the larger torso size.

WATCH THE VIDEO

How to Choose a Pack Size

The Unbound is designed for the on-trail backpacker and all-day thru hiker, prioritizing mobile storage and easy accessibility while covering big miles. Built to enhance efficiency, this pack features the latest on-trail innovations to keep your gear within reach while you stay focused on the trail, maximizing your time on the move.

DESIGNED FOR:

Backpacking

KEY FEATURES:
  • Dual-entry stretch mesh front pockets ensure organized storage and quick access to gear.
  • Large, easy-to-reach side pockets keep water bottles or gear accessible on the go.
  • Exterior bottom pocket with dual entry provides quick access to snacks or trash storage.

Product Walkthrough Video | Unbound

WHY CHOOSE THE UNBOUND 40?

A white triangle logo on a black background.

ACCESSIBILITY ON THE MOVE

Large dual-entry front external pocket for quick grabs without needing to dig through everything inside. Generously sized side pockets and a stretch bottom pocket add even more storage options

A white triangle logo on a black background.

MAKE IT YOUR OWN

Low-profile daisy chains allow countless ways to carry external items for different kinds of trips. Remove or add top-side compression straps depending on needs, or shock cord for oddly shaped gear

A white triangle logo on a black background.

COMPLETE SEAM TAPING

With the exterior binding, seam bulking is eliminated within the pack, allowing for more efficient taping and improved water resistance
average rating 4.7 out of 5
Based on 135 reviews
  • 5 Stars
    110 Reviews
  • 4 Stars
    16 Reviews
  • 3 Stars
    7 Reviews
  • 2 Stars
    1 Review
  • 1 Star
    1 Review
93% of reviewers would recommend this product to a friend
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Rate your level of experience in the backcountry.
Rated 3 out of 5
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Review posted
Reviewed by David U.
Verified Buyer
Unbound
Reviewing
Unbound
Age Range
45 - 54
What activities did you use this product for?
  • Backpacking
What size pack did you order?
Large
Rated 5 out of 5

Unbound 55

What it claims. Replacing my Osprey AG 65 with this pack for lighter weight.

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Rated 0 on a scale of minus 2 to 2, where minus 2 is Too Small, 0 is Just Right and 2 is Too Big
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Rated 3 out of 5
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Review posted
Reviewed by Layla S.
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Unbound
Reviewing
Unbound
Age Range
25 - 34
What activities did you use this product for?
  • Backpacking
What size pack did you order?
Medium
Rated 5 out of 5

Perfect pack!

I love how light this pack is. It has no compromise on comfort or stability.

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Rated 4 out of 5
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Review posted
Reviewed by John St D.
Verified Buyer
Unbound
Reviewing
Unbound
Age Range
55 - 64
What activities did you use this product for?
  • Backpacking
  • Day Hiking
  • Fly Fishing
What size pack did you order?
Medium
Rated 5 out of 5

Unbound 40

Great fit was worried about the belt fitting me on the medium size pack…I ordered the Larger belt but didn’t need it because the medium belt fit me perfectly with extra to spare…..

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Rated 1 on a scale of minus 2 to 2, where minus 2 is Too Small, 0 is Just Right and 2 is Too Big
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Rated 3 out of 5
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Review posted
Reviewed by Eric S.
Verified Buyer
Unbound
Reviewing
Unbound
Age Range
45 - 54
What activities did you use this product for?
  • Backpacking
  • Day Hiking
What size pack did you order?
Large
Rated 5 out of 5

Comfortable

I was looking for a lightweight pack with comfort. So far this has been great, it’s the only pack I can actually reach my water bottle. This pack is comfortable, and feature rich. I was worried about the comfort, because I use Osprey AG Atmos, but I won’t go back to Osprey. This in my opinion is a far better choice.

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Rated 4 out of 5
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Review posted
Reviewed by Christopher S.
Verified Buyer
Unbound
Reviewing
Unbound
Rated 5 out of 5

Great Pack!

Climbed Mt Washington with one. Great pack. Comfortable, light, reliable, and functional!

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