Hyperlite mountain gear UNBOUND 55L backpack white

Hyperlite Mountain Gear Unbound 55 White – ultralight backpack for long-distance hiking

The Hyperlite Mountain Gear Unbound 55 White is designed for thru-hiking, long-distance hiking, and anyone who wants to keep pack weight down without compromising on durability, functionality, and comfort.

The updated Unbound 55 is both lighter and stronger than its predecessor thanks to the extremely durable Dyneema® Woven Composite 3.9 material. With a listed weight of 819 grams in size Medium, the backpack combines low weight with a sturdy construction that can handle loads of up to approximately 18 kg.

Two anatomically shaped, removable aluminum ribs provide improved stability and weight distribution. Together with a redesigned hip belt and wider, more naturally contoured shoulder straps, this ensures greater comfort even during longer days with heavier loads.

The new design features internally taped seams and discreet, sewn-in attachment points for a cleaner look. The removable compression system makes it easy to adjust the backpack to the size of your load and attach items such as hiking poles or larger water bottles.

Well-thought-out features for long hikes

• Dyneema® Woven Composite 3.9: A highly durable, lightweight material developed for demanding use.
• Improved carrying system: Two removable, contoured aluminum stays provide extra stability and better weight distribution.
• Ergonomic shoulder straps: Wider shoulder straps with a more natural curve around the neck and shoulders. Additional reinforced attachment points allow for greater adjustability of the chest strap’s position.
• Removable hip belt: A padded hip belt with V-Pull adjustment provides good support and can be customized to the user.
• Large front pocket with dual access: Stretchy Dyneema mesh makes it easy to organize and quickly access gear.
• Easily accessible side pockets: Spacious pockets for water bottles and other gear needed during the hike.
• Extra bottom pocket: Handy for gear you want to reach without taking off your backpack.
• Removable compression system: Adjustable side straps and elastic loops keep your pack compact and allow you to secure taller items.
• Y-shaped top strap: Allows you to secure extra gear on top of the backpack.
• Roll-top closure: Adjusts the packing volume to fit the contents and provides a weather-resistant seal.
• Internal back panel: An integrated foam panel that provides structure and improved comfort against the back.
• Daisy chains: Discreet vertical and horizontal attachment points for extra gear and customization.
• Internal taped seams: Provide a cleaner finish and improved protection against moisture.

Smart details that make a difference on the trail

The Hyperlite Mountain Gear Unbound 55 is thoughtfully designed down to the smallest detail. With easily accessible pockets, flexible attachment systems, and a removable hip belt, you can customize the backpack to suit both your packing needs and the demands of your hike.

Maximized storage space

Every pocket serves a purpose. The spacious side pockets make it easy to reach water bottles without taking off the backpack. The large front pocket, which opens from two sides, provides quick access to rain gear and other equipment. A practical bottom pocket lets you store small items you’ll want to access during your hike.

Flexible and Customizable Packing

The removable compression system with elastic cords and adjustable hooks makes it easy to secure hiking poles, larger water bottles, or other gear to the outside of the backpack. The system can be customized to your needs or removed entirely to save weight.

Removable hip belt for better weight distribution

The padded hip belt provides extra support when your load gets heavier and helps distribute the weight from your shoulders to your hips. With the smooth V-Pull system, you can easily adjust the fit even while hiking. The hip belt is fully removable, allowing you to reduce weight when carrying a lighter load.

Specifications – Unbound 55 White

The weight listed is the average weight for size Medium. Weight may vary by size. Please verify the weight information for the white color option before publication.

Size Guide – Hyperlite Mountain Gear Unbound 55

To choose the right size for your Unbound 55 , it’s your back length—not your overall height—that matters. The correct size ensures better weight distribution, increased comfort, and proper positioning of the hip belt.

How to Measure Your Back Length

1. Locate the C7 vertebra: Tilt your head slightly forward and feel for the distinct vertebra at the base of your neck. This is your seventh cervical vertebra (C7) and the starting point for your measurement.
2. Measure along the spine: Ask someone to help you measure with a soft measuring tape from C7 downward along the spine’s natural curve.
3. Find the upper edge of the hip bone: Place your hands on your hips so that they rest on the iliac crests. Let your thumbs point backward toward the spine.
4. Complete the measurement: Measure down to the point where the tape measure crosses an imaginary horizontal line between your thumbs. The distance is your back length.

Size Chart

Between two sizes?
If your back length falls right on the border between two sizes, Hyperlite Mountain Gear recommends choosing the larger size. For example, if your back length is 43 cm, you should choose Medium over Small.

Tip: Feel free to ask someone else to help you measure. It’s easier to get an accurate measurement if you stand relaxed while someone else holds the measuring tape.

See the Hyperlite Mountain Gear Unbound in detail

The Hyperlite Mountain Gear Unbound 55 White is an excellent choice for anyone looking for a lightweight, durable, and well-designed backpack for everything from multi-day trips in the mountains to long thru-hikes where low weight, freedom of movement, and easy access to gear make all the difference.