Uncompromising Waterproof Performance for Overnight and Alpine Missions
​Built for the rigors of winter mountaineering and demanding overnight backpacking trips, the Montbell Alpine Pack 40 seamlessly blends high-level weather protection with heavy-load carrying comfort. This 40-liter workhorse features Montbell's highly water-resistant Aqua Barrier Sack combined with a Roll-Up Closure System, ensuring your essential gear stays completely dry in punishing conditions. Engineered with the Super Wishbone System, the pack utilizes an adjustable aluminum frame to precisely transfer weight to your hips, delivering a fine-tuned fit that moves with your body on technical terrain.
​Why We Love It
​Here at X-Boundaries, we know that carrying heavy winter gear or overnight equipment requires serious suspension. We love the Alpine Pack 40 because it refuses to compromise on either load-bearing comfort or weatherproofing. The EVA foam back panel offers excellent cushioning and dries incredibly fast, while the adjustable torso length ensures a custom fit for every hiker. We are especially big fans of the removable top lid—when you finally establish basecamp, simply detach the lid and use the included strap to wear it as a waist or sling pack for quick summit dashes or localized exploring.
​Key Features
- ​Roll-Up Closure System: Provides rapid, wide-mouth access to the main compartment and features pocketable side buckles to securely fasten the roll-top down the sides.
- ​Aqua Barrier Sack: An integrated, highly water-resistant liner (covering both the main body and top lid) that delivers exceptional waterproofness without the need for a separate rain cover.
- ​Super Wishbone System: Features a highly adjustable internal aluminum frame that stabilizes heavy loads and transfers weight efficiently to the articulated hipbelt.
- ​Adjustable Torso Length: The shoulder harness can be dialed in to accommodate three distinct back lengths (19.3", 20.8", 22.4") for a perfectly customized fit.
- ​Convertible Top Lid: Easily detaches and transforms into a standalone waist pack or sling bag (strap included) for minimalist side trips.
- ​EVA Foam Back Panel: Delivers premium cushioning against the spine while offering excellent breathability and quick-drying properties.
- ​Advanced Gear Storage: Equipped with a 2-way accessible side pocket (reachable while wearing the pack), an ice axe/pole strap, and side compression straps to secure long items and keep the load tight against your center of gravity.
- ​Hydration Compatible: Fully equipped to house your hydration reservoir for hands-free drinking on the move.
​Technical Specifications
- Main Material: 100-denier nylon ripstop (Urethane coating)
- Bottom Material: 210-denier nylon ripstop (Urethane coating) for enhanced abrasion resistance
- Back Panel: Quick-drying EVA foam
- Capacity: 40 LÂ
- Weight: 1.49 kgÂ
- Dimensions: 68 x 28 x 22 cm
- Torso Length : Adjustable: 49 cm, 53 cm, 57 cm
- Country of Origin: Philippines
- Style #1133364
Note: This product contains PFAS and cannot be shipped to some jurisdictions.
Care & Maintenance
​To preserve the structural integrity of the Super Wishbone frame and the waterproofing of the Aqua Barrier Sack, please follow these guidelines:
- ​Cleaning: Do not machine wash. Spot clean dirt, salt, or mud using a soft sponge dampened with lukewarm water and a mild, non-detergent soap.
- ​Drying: Wipe off excess moisture with a clean towel. Hang the pack to air dry completely in a well-ventilated, shaded area. Strictly avoid direct sunlight and artificial heat.
- ​Storage: Store in a cool, dry place. Ensure the pack and the interior Aqua Barrier Sack are 100% dry before storing to prevent mildew and the degradation of the urethane coatings.
​The X-Boundaries Guarantee
​Gearing up for a winter ascent or a multi-day trek? Visit X-Boundaries today to test the load-carrying comfort of the Montbell Alpine Pack 40. Let our pack-fitting experts adjust the Super Wishbone frame to your exact torso length so you can hit the mountain with confidence!
