---
title: "Hyperlite Mountain Gear Unbound 55"
name: "Hyperlite Mountain Gear Unbound 55"
brand: "Hyperlite Mountain Gear"
description: "A well-designed backpack from the legendary American brand Hyperlite Mountain Gear, specifically aimed at long-distance trails – now with a volume of 55 liters, it offers an even wider range of options and uses."
handle: "hyperlite-mountain-gear-unbound-55"
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  - name: "Hyperlite Mountain Gear Unbound 55"
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last_updated: "2026-10-13"
---

# Hyperlite Mountain Gear Unbound 55

Brand: Hyperlite Mountain Gear · Category: [Backpacks](/c/backpacks.md)
Backpack size: Medium, Large, Small, Tall · Removable hipbelt: Yes · Seam-sealed: Yes

## Offer

- Price: €413.70
- Availability: In stock
- Condition: New
- Buy on the website: [HTML product page](/p/hyperlite-mountain-gear-unbound-55)

## Description

A well-designed backpack from the legendary American brand Hyperlite Mountain Gear, specifically aimed at long-distance trails – now with a volume of 55 liters, it offers an even wider range of options and uses. The backpack features a simple construction with plenty of pockets and customization options. It is made from super durable, lightweight, and waterproof Dyneema® material.

Ultralight durable backpack with a capacity of 55 liters for true ultralight and thru-hiking enthusiasts.

## Backpack for thru-hikers

There is no better way to **effectively assess a backpack's design than to send it on a thru-hike**. Over more than 3 000 kilometers and an average of five to six months, day after day, loaded, shaken, dragged, and exposed to the elements – this is where the truth is revealed. This is exactly the kind of expedition backpack that HMG was looking for, and the Unbound series is the result.

Every carefully thought-out feature fought for its right to remain, leaving only what is essential for an **efficient, comfortable, adaptable, and reliable** backpack. Long-distance trails are tough, so let a portion of the weight rest on the Unbound 55 backpack.

The Unbound 55 differs from the original [Unbound 40](/p/hyperlite-mountain-gear-unbound-40) model only in its **larger internal capacity (55 liters)**. This allows for a **wider range of uses**, such as packing **food for 5 or more days**, carrying **shared gear for two people**, or **extra items** for your dog. Thanks to its roll-top closure, removable hip belt, and internal frame, the Unbound 55 is also well-suited for **shorter trips** and **mountain summits**.

[Video](https://youtu.be/8YNyQOeZ5B0)

## Specifications

**Backpack closure**: Roll-top closure system with removable side compression straps for easy compression and securing gear.

**Hip belt**: The redesigned removable hip belt offers better padding and customization options. It is made using Hardline Dyneema® material, robust dual-density foam with a closed structure (water-resistant), and spacer mesh.

**Back panel**: Integrated plastic panel with high-density foam padding measuring 0,63 cm thick.

**Side straps**: Side vertical straps for connection to the roll-top closure provide additional compression and can be removed.

**Upper compression straps**: The Y-shaped upper straps are adjustable at two points and are designed to secure additional gear or clothing.

**Shoulder straps**: Shoulder straps made of Hardline Dyneema® material with closed-cell foam and spacer mesh.

**Chest strap**: The redesigned chest strap allows for an adjustable position in the vertical direction along the shoulder straps.

**Buckle/straps**: Reduced buckles with a width of 1,6 cm and straps reduce weight without compromising durability.

**Backpack reinforcement**: The backpack is reinforced with one molded aluminum frame, which is easily removable.

**Seam sealing**: All vertical seams and all sewn elements of the backpack are sealed with waterproof tape, ensuring great waterproofness of the backpack.

**Large stretch pocket**: A large pass-through pocket with dual access on the front provides important storage space and quick access for items such as a wet tent/tarp, food, water filter, tent stakes, etc. The pocket is made from durable Dyneema® Stretch Mesh material.

**Side pockets**: Really spacious side pockets are equipped with drawstrings and can easily accommodate 2-liter bottles or additional gear.

**Bottom (trash) pocket**: The bottom stretch pocket is made from durable Dyneema® Stretch Mesh material and is ideal for easy access to snacks, a waterproof jacket, or trash.

**Daisy chain**: Four orange vertical straps with holes are sewn into the seams of the backpack and are used to attach additional gear and to customize the backpack for a specific expedition.

**Compatible accessories** (sold separately): [Shoulder Pocket](/p/hyperlite-mountain-gear-shoulder-pocket), [Bottle Pocket](/p/hyperlite-mountain-gear-bottle-pocket), fanny pack [Versa](/p/hyperlite-mountain-gear-versa), [Camera Pod](/p/hyperlite-mountain-gear-camera-pod), waterproof dry bags and organizers [Side Entry Pod](/p/hyperlite-mountain-gear-side-entry-pod), [Gear Pods](/p/hyperlite-mountain-gear-pods) and [Roll-Top Stuff Sack](/p/hyperlite-mountain-gear-roll-top-stuff-sack-10-l).

## Technical parameters

- **Internal volume**: 55 liters
- **External volume**: 9 liters
- **Weight**: 856 grams – white color, 967 grams – black color
- **Load capacity**: up to 18,1 kg
- **Width of the back panel**: 25,4 cm
- **Height of fully unrolled backpack**: 97,8 cm
- **Upper circumference of the backpack**: 101,6 cm
- **Bottom circumference of the backpack**: 88,9 cm

The specified parameters are for size Medium.

## Materials

Dyneema® fiber is a revolutionary material not only in the outdoor industry. With its remarkable strength-to-weight ratio, it is **the** **strongest fiber in the world**. Dyneema® fibers are 15x stronger than high-quality steel, lightweight, abrasion-resistant, waterproof, and resistant to UV radiation and chemicals.

The **HMG Unbound 55** backpack **in white** is constructed from hybrid composite Dyneema® fabric—**Dyneema® Composite Hybrid 3.8** (120 g/m², DCH50) and **Dyneema® Composite Hybrid 5.1** (170 g/m², DCH150) on the bottom and back panel. The HMG Unbound 40 backpack **in black** is fully constructed from the more durable Dyneema® material—**Dyneema® Composite Hybrid 5.1** (170 g/m², DCH150).

This material is created by combining and laminating additional layers with Dyneema® fibers. This material excels in **high abrasion resistance, exceptional strength, outstanding rip-stop properties, and moisture impermeability**.

Although the material itself is 100% waterproof, stitching creates tiny perforations. While most (more than 90%) seams in the backpack are taped, it cannot be considered completely waterproof. For full protection against water and moisture, we recommend using the backpack with [waterproof dry bags](/c/gear/drybags-and-organisers).

## How to choose the size?

| Backpack size | Length of the torso |
| --- | --- |
| Small | 38-43 cm |
| Medium | 43-48 cm |
| Large | 48-53 cm |
| Tall | more than 53 cm |

**If you are unsure about choosing the right size, you can contact us. We will be happy to help you.**

[Video](https://youtu.be/rs0vA343neo)

## Specs

- Color: White, Black
- Backpack size: Medium, Large, Small, Tall
- Removable hipbelt: Yes
- Seam-sealed: Yes
- Waterproof material: Yes
- Backpack frame: Aluminum frame
- Backpack padding: Yes
- Backpack removable frame: Yes
- Maximum load capacity: 18.1 kg
- Sex: unisex
- Material: Dyneema stretch mesh, Hardline with Dyneema, DCH50, DCH150
- Material composition: Nylon, Polyester, Ultra High Molecular Weight Polyethylene (UHMWPE)
- Volume: 64 l
- External volume: 9 l
- Internal volume: 55 l
- Weight: 856 g
- Woocommerce product id: 106665
- Brand: Hyperlite Mountain Gear

## Variants

- Hyperlite Mountain Gear Unbound 55 - Medium, White · SKU 3-10855-2 · EAN 0644216457199 · €443.30 · Out of stock · Medium, White
- Hyperlite Mountain Gear Unbound 55 - Large, Black · SKU 3-20855-3 · EAN 0644216457694 · €447.50 · Out of stock · Black, Large
- Hyperlite Mountain Gear Unbound 55 - Medium, Black · SKU 3-20855-2 · EAN 0644216457595 · €485.50 · Out of stock · Medium, Black
- Hyperlite Mountain Gear Unbound 55 - Tall, White · SKU 3-10855-4 · EAN 0644216457397 · €413.70 · Out of stock · White, Tall
- Hyperlite Mountain Gear Unbound 55 - Small, White · SKU 3-10855-1 · EAN 0644216457090 · €413.70 · In stock · Small, White
- Hyperlite Mountain Gear Unbound 55 - Large, White · SKU 3-10855-3 · EAN 0644216457298 · €413.70 · In stock · Large, White
- Hyperlite Mountain Gear Unbound 55 - Tall, Black · SKU 3-20855-4 · EAN 0644216457793 · €447.50 · In stock · Black, Tall
- Hyperlite Mountain Gear Unbound 55 - Small, Black · SKU 3-20855-1 · EAN 0644216457496 · €447.50 · In stock · Black, Small

## Related

- [Hyperlite Mountain Gear Unbound 40](/p/hyperlite-mountain-gear-unbound-40.md)
- [Hyperlite Mountain Gear Bottle Pocket](/p/hyperlite-mountain-gear-bottle-pocket.md)
- [Hyperlite Mountain Gear Windrider 55](/p/hyperlite-mountain-gear-windrider-55l.md)
- [Hyperlite Mountain Gear Camera Pod](/p/hyperlite-mountain-gear-camera-pod.md)
- [Hyperlite Mountain Gear Pack Accessory Straps](/p/hyperlite-mountain-gear-pack-accessory-straps.md)
- [Hyperlite Mountain Gear Southwest 55 (2025)](/p/hyperlite-mountain-gear-southwest-55.md)
- [Hyberg ATTILA ULTRA](/p/hyberg-attila-ultra.md)
- [Hyperlite Mountain Gear Pods](/p/hyperlite-mountain-gear-pods.md)

## Shipping and returns

- [Shipping and payment](/shipping-payment)
- [Returns](/return-order)

## Images

- ![Hyperlite Mountain Gear Unbound 55](https://media.gramino.com/medusa/cb52d2158e6150209bc5b58bd40b03b3-01KWHVN6QFVVZAX9KZ1EN4BBNY.jpg)
- ![Hyperlite Mountain Gear Unbound 55](https://media.gramino.com/medusa/822594b6c63ab7139dd1acfd0c945105-01KWHVN6VJDVTYKG945WJA1P33.jpg)
- ![Hyperlite Mountain Gear Unbound 55](https://media.gramino.com/medusa/db93e450fa321a4a826d0cbb6cd62b59-01KWHVN716011XRCPHR5V40G57.jpg)
- ![Hyperlite Mountain Gear Unbound 55](https://media.gramino.com/medusa/06dba9751de5839237a4c2899ebee645-01KWHVN6ZSQED7ZQDSHAQRTDQ5.jpg)
- ![Hyperlite Mountain Gear Unbound 55](https://media.gramino.com/medusa/d1c9d487dd0f02ea3bc771b71af53528-01KWHVN6727N1KQ71YFGCWN2VE.jpg)
- ![Hyperlite Mountain Gear Unbound 55](https://media.gramino.com/medusa/702e265e1ccb0e32ec6d6a0d2865df39-01KWHVN69V7RJS6GZR7965XK6E.jpg)
- ![Hyperlite Mountain Gear Unbound 55](https://media.gramino.com/medusa/f1afcdec1e9dee6442ae8f074ad9d31c-01KWHVN6ASSBXFF6VXCTCZ839R.jpg)
- ![Hyperlite Mountain Gear Unbound 55](https://media.gramino.com/medusa/31ec83ed4bbe997e89f8c4236801d710-01KWHVN6DWPD76S4VXYHKJF6GS.jpg)

## Identifiers

- SKU: 3-10855-1
- EAN: 0644216457090
- Handle: hyperlite-mountain-gear-unbound-55
- Brand: Hyperlite Mountain Gear

This product is also available as [HTML](/p/hyperlite-mountain-gear-unbound-55).

Category: [Backpacks](/c/backpacks.md) · [Sitemap](/sitemap.md)

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}
```