Hyperlite Mountain Gear Junction 40 (2025)

The most versatile HMG pack

The Hyperlite Mountain Gear Junction backpack is a symbol of versatility and adaptability. It combines two side pockets made of durable material and a large front mesh pocket that's perfect for drying wet clothes or gear. It's great for a wide range of conditions – from narrow overgrown trails to rocky terrain and humid mountain crossings.

The 40-liter volume is just right for shorter and weekend hikes. Thanks to the roll-top closure and compression straps on each side, you can easily shrink the backpack, making it useful even for day hikes in the mountains. If you want to embark on longer adventures with the Junction 40 backpack, you'll really need to have a well-tuned and lightweight gear list, plus the ability to regularly (every 2–4 days) replenish your food supplies along the way.

Backpacks from Hyperlite Mountain Gear are among the most popular for long-distance hikes in America, like the Pacific Crest Trail and the Continental Divide Trail, and we think that says a lot (this info comes from annual surveys on the blog halfwayanywhere.com).

Specifications

• Top closure – roll-top system with Velcro, upper Y-compression strap.
• Back panel – integrated foam panel (0,6 cm) and sewn-through construction for ergonomic curvature.
• Reinforcement – two removable aluminum struts for better load transfer.
• Hip belt – padded with double-layer foam and spacer mesh, two pockets with waterproof YKK zippers.
• External pockets – two deep side pockets made of tough Hardline material with Dyneema®, a large rear mesh pocket with an elastic hem.
• Shoulder straps – comfy, wide enough, and padded shoulder straps with an ergonomic curve.
• Chest strap – sliding and adjustable, with expanded attachment options.
• Compression straps – removable, adjustable attachment, option to centralize the load.
• Hydration – a simple system with a hanging loop and port on the upper back.
• Taped seams – all side seams and the seams under the pockets are taped to enhance water resistance.
• Accessory options – compatible, for example, with Shoulder Pocket, Bottle Pocket, Versa, Pods, inside the loop for attaching an additional pocket.

Materials

The main part of the Hyperlite Mountain Gear Southwest backpack is made from a new material. Dyneema® Woven Composite 3.9, which brings a combination of low weight, high strength, and top-notch abrasion resistance. Thanks to the fully woven outer layer made from Dyneema® fibers, the material is extremely strong and durable, feels nicer to the touch, holds its shape better, and doesn't make annoying noises even in cold weather.

The material itself is 100% waterproof, but the stitching might create tiny holes. Even though more than 90% of the seams on the backpack are taped, you can't call it 100% waterproof. For complete protection against water and moisture, we recommend adding a waterproof bags.

The side pockets of the backpack and the pockets on the hip belt are made from a highly durable and strong material Hardline with Dyneema®, which can handle tough terrain. The large front pocket is made of thick mesh with an elastic hem.