A black waterproof backpack cover with a white triangular logo on the front, shown on a clean white background.
A dual-color backpack in white and black, featuring a white top section with a black Y-shaped zipper, a black lower body, and a small triangular logo patch on the front.
A technical outdoor backpack shown from the side against a plain white background. The backpack features a white upper body with black compression straps and a black lower compartment and shoulder straps.
The rear view of a technical hiking backpack in white and black, featuring a breathable white shell, black padded shoulder straps, a black hip belt, and an orange quick-release buckle on the compression strap.
A technical hiking backpack shown from a three-quarters rear angle on a clean white background. The backpack features a white upper shell, a black lower body panel, black shoulder straps, and a black hip belt with a small orange adjustment slider.
A technical outdoor backpack shown from the side against a plain white background. The backpack features a dual-tone design with a light heather gray top section and a solid black lower section, including the shoulder straps and hip belt.
A black technical outdoor backpack shown from the side against a clean white background.
A black technical hiking backpack shown from the back, featuring padded shoulder straps, compression buckles, and an orange quick-release buckle, photographed on a clean white background.
A black technical backpack shown from the side against a plain white background, featuring a padded upper section, compression straps, and a small attached pouch.
A black technical backpack shown from the side against a plain white background, featuring a white triangular logo on the upper section.
A hiker wearing a black and white backpack walks along a rocky forest trail surrounded by green trees and foliage.
A black waterproof backpack cover with a white triangular logo on the front, shown on a clean white background.
A dual-color backpack in white and black, featuring a white top section with a black Y-shaped zipper, a black lower body, and a small triangular logo patch on the front.
A technical outdoor backpack shown from the side against a plain white background. The backpack features a white upper body with black compression straps and a black lower compartment and shoulder straps.
The rear view of a technical hiking backpack in white and black, featuring a breathable white shell, black padded shoulder straps, a black hip belt, and an orange quick-release buckle on the compression strap.
A technical hiking backpack shown from a three-quarters rear angle on a clean white background. The backpack features a white upper shell, a black lower body panel, black shoulder straps, and a black hip belt with a small orange adjustment slider.
A technical outdoor backpack shown from the side against a plain white background. The backpack features a dual-tone design with a light heather gray top section and a solid black lower section, including the shoulder straps and hip belt.
A black technical outdoor backpack shown from the side against a clean white background.
A black technical hiking backpack shown from the back, featuring padded shoulder straps, compression buckles, and an orange quick-release buckle, photographed on a clean white background.
A black technical backpack shown from the side against a plain white background, featuring a padded upper section, compression straps, and a small attached pouch.
A black technical backpack shown from the side against a plain white background, featuring a white triangular logo on the upper section.
A hiker wearing a black and white backpack walks along a rocky forest trail surrounded by green trees and foliage.
Hyperlite Mountain Gear

Hyperlite Mountain Gear Unbound 55L Ultralight Backpack

$649.95
/
Tax included. Shipping calculated at checkout.
Colour
Size

The Unbound is Hyperlite Mountain Gear's redesigned thru-hiking pack, built from Dyneema® Woven Composite 3.9 for an ultralight, highly abrasion-resistant carry. This 55L version scales up the design for longer resupply gaps and heavier loads, while keeping the same dual-entry stretch-mesh front pocket, twin side bottle pockets and bottom stash pocket for gear you need on the move. Removable, contoured aluminium stays and a V-Pull hip belt add structure and support, and wider, naturally curved shoulder straps and adjustable roll-top compression straps round out the carry system. Suits thru hikes, multi-day trips and long-distance trails where low pack weight matters most.

Features

  • Dyneema® Woven Composite 3.9 main body fabric — puncture and abrasion-resistant, with internal seam taping.
  • 100D Dyneema® Gridstop reinforcement in high-wear zones.
  • Dual-entry Dyneema® Stretch Mesh front pocket for quick-access, on-the-move storage.
  • Large side bottle pockets for one-handed access to water and other essentials.
  • Bottom stash pocket for wet or frequently used gear.
  • Two removable, contoured aluminium stays for structure and load transfer.
  • Removable hip belt with V-Pull cinch system and cushioned padding for heavier loads.
  • Roll-top closure with removable, adjustable compression straps for volume control and securing trekking poles or oversized bottles.
  • Low-profile, sewn-in daisy chains (vertical and horizontal) for external gear attachment.
  • Wider, naturally curved shoulder straps for comfort under load.
  • Five torso-fit sizes (XS-Tall) to dial in the carry.
  • Taller body than the 40L version for longer resupply stretches and bulkier gear.
  • Rated to carry up to 18kg (40lb).

Specifications

Weight 819g (28.9oz), size Medium average — will vary slightly by torso size
Volume 55L total, including 9L combined external pocket volume (front, side and bottom pockets)
Torso Fit Range XS (under 38cm / 15in), S (38-43cm / 15-17in), M (43-48cm / 17-19in), L (48-53cm / 19-21in), Tall (over 53cm / 21in+)
Materials Dyneema® Woven Composite 3.9 (main body), 100D Dyneema® Gridstop (reinforcement), Dyneema® Stretch Mesh (pockets)
Frame Type Two removable, contoured aluminium stays
Access Style Roll-top, adjustable volume
Pockets/Compartments 1 Main Compartment, 1 Dual-Entry Front Stretch Mesh Pocket, 2 Side Bottle Pockets, 1 Bottom Stash Pocket (9L combined external pocket volume)
Max Load 18kg (40lb)
Colour Black, White

The standard local delivery time from our store in Melbourne for orders placed before noon is 2–7 business days via Australia Post standard delivery. Express Post is also available. Please see our Shipping page for more details. International Orders are subject to flight availability.

If you'd like to know availability and delivery times for a specific item please contact us and we will get back to you asap.

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About hyperlite mountain gear

'Essentialism' is the HMG philosophy - the brand is built on the belief that having the right gear–nothing more than one needs to achieve success, and nothing less than is necessary to do so comfortably, safely, and precisely–results in a transformational outdoor experience.

ULTRALIGHT DYNEEMA GEAR

Dyneema® Composite Fabrics are high-performance, non-woven, rip-stop, composite laminates.

The material's unique properties allow for continual flex at stress points without compromising strength or structural integrity. Lighter than Silnylon but stronger than Kevlar, Dyneema® Composite Fabrics are 100% waterproof prior to stitching with high chemical and UV resistance.

The result? A rangle of ultralight, reliable backpacking gear, where durability and functionality doesn't need to result in a weight compromise. It is gear designed to function perfectly, consistently, and become a seamless extension of the user, so the focus can remain solely on the backcountry experience.

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