Description

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   Hyperlite Mountain Gear Pemi 15

   The Hyperlite Mountain Gear Pemi 15 is a low-volume hybrid running vest designed for fastpacking, mountain running, and long days where keeping your gear close and stable matters. With a 15-liter capacity and a weight of just 12.4 oz / 352 g, the Pemi 15 combines a full-connection vest harness with a structured welded back panel to minimize bounce while keeping essential gear within easy reach. Its ALUULA® 97 construction adds durability and water resistance while allowing Hyperlite Mountain Gear to use thermo-welded construction for a clean, lightweight design. With dedicated flask pockets, multiple front and side pockets, external storage, hydration compatibility, and built-in trekking pole and ice axe carry, the Pemi 15 is designed for moving quickly through technical terrain without constantly stopping to access your gear.

   Rikkar Specs

   Specification	Details
   Capacity	15 L
   Weight	12.4 oz / 352 g
   Back Width	8.25 in / 21 cm
   Height	23 in / 58.4 cm
   Top Circumference	23.75 in / 60.3 cm
   Bottom Circumference	19 in / 48.3 cm
   Material	ALUULA® 97, breathable air mesh, UHMWPE stretch mesh, Lycra stretch mesh
   Harness	Full-connection running vest harness
   Hydration	Hydration bladder compatible
   Front Flask Pockets	2
   Front Swoop Pockets	2
   Front Zippered Pockets	2
   Side Swoop Pockets	2
   Closure	Roll-top
   Side Access	Dual-slider YKK #5 zipper
   Pole Carry	Integrated
   Ice Axe Carry	Integrated
   Country of Manufacture	Mexico

   The listed 12.4 oz / 352 g weight is the average weight for a size medium.

   Key Features

   • 15-liter hybrid running vest
   • 12.4 oz / 352 g average weight
   • Full-connection vest harness
   • Designed to minimize pack bounce while running
   • ALUULA® 97 construction
   • Thermo-welded components
   • Welded foam back panel
   • Breathable air mesh harness
   • Hydration bladder compatible
   • External hydration hose routing
   • Two flask pockets
   • Two front swoop pockets
   • Two front zippered pockets
   • Two side swoop pockets
   • Adjustable sternum system
   • Low-profile integrated whistle
   • UHMWPE stretch mesh front pocket
   • Full-length external daisy chains
   • Roll-top closure
   • Vertical compression straps
   • Dual-slider YKK #5 side zipper
   • Removable over-the-top compression strap
   • Integrated trekking pole carry
   • Dedicated ice axe carry
   • Designed for loads up to approximately 15 lb

   ALUULA® 97 Construction

   The Pemi 15’s most significant design feature is its use of ALUULA® 97, an advanced composite material built around an UHMWPE core.

   Unlike traditional sewn pack construction, the Pemi 15 uses thermo-welding on key components. This creates clean, strong connections while reducing the need for additional stitching and overlapping material.

   The result is a pack that combines low weight with a high level of durability and water resistance. The material also gives the Pemi 15 a more structured feel than a typical lightweight running vest.

   For fastpacking and mountain running, that combination is important. The pack needs to move with the wearer without becoming floppy or bouncing excessively as the terrain becomes more technical.

   Running Vest Harness

   The Pemi 15 uses a full-connection vest harness designed to keep the pack’s center of gravity close to the body.

   This is one of the biggest differences between the Pemi 15 and a conventional small backpack. Instead of relying primarily on shoulder straps and a traditional hipbelt, the vest-style harness wraps around the torso and distributes the load across a larger area.

   The harness uses breathable air mesh to improve comfort while running, and the adjustable sternum system allows the fit to be fine-tuned for different body shapes and clothing layers.

   A close, secure fit is especially important when moving quickly. Less movement between the pack and your body means less bouncing, shifting, and distraction on uneven terrain.

   Storage & Accessibility

   The Pemi 15 is designed around the idea that anything you need frequently should be accessible without stopping.

   The front of the pack also features a durable UHMWPE stretch mesh pocket for wet layers or other gear that you want to keep outside the main front harness includes two flask pockets, two swoop pockets, two zippered pockets, and an adjustable sternum system. This gives you several places to organize water, food, electronics, navigation equipment, and other frequently used items.

   The front of the pack also features a durable UHMWPE stretch mesh pocket for wet layers or other gear that you want to keep outside the main compartment.

   Full-length low-profile daisy chains provide additional attachment points, allowing you to lash equipment externally without significantly increasing the pack’s footprint.

   Hydration

   The Pemi 15 is designed to work with a hydration bladder, with the bladder compartment positioned outside the main pack compartment.

   This arrangement provides a dedicated location for the reservoir while allowing the hydration hose to be routed through the vest and kept accessible while moving.

   Keeping hydration separate from the main compartment also helps protect the rest of your gear from accidental leaks.

   For long mountain days, the combination of a hydration bladder and easily accessible front flask pockets gives you several options for carrying and managing water.

   Trekking Pole & Ice Axe Carry

   The Pemi 15 is designed for terrain where trekking poles and mountain tools are part of the kit.

   Two removable corded hooks provide on-the-go trekking pole storage on the underside of the pack. This allows poles to be stowed without completely stopping to reorganize the pack.

   The pack also includes a dedicated ice axe carry system. Vertical compression straps can be used to secure an axe or other longer equipment against the pack.

   These features make the Pemi 15 particularly useful beyond straightforward trail running. It’s designed for fast movement through technical mountain terrain where equipment can change throughout the day.

   Compression & Weather Protection

   The roll-top closure provides a simple way to adjust the pack’s volume depending on how much gear you’re carrying. Vertical compression straps help keep the load compact and stable as the contents change.

   An additional removable over-the-top strap provides another option for compressing the pack or carrying equipment externally.

   The ALUULA® 97 construction and welded seams also provide a meaningful level of water resistance. The Pemi 15 isn’t intended to replace a fully waterproof dry bag for sensitive equipment, but its material and construction provide significantly more protection from wet conditions than a typical lightweight running vest.

   Fit & Sizing

   The Pemi 15 is sized according to chest circumference rather than torso length. Because the vest is designed to fit snugly around the body and minimize movement while running, getting the correct size is particularly important.

   Size	Chest Circumference
   Small	34–38 in / 86–97 cm
   Medium	38–40 in / 97–102 cm
   Large	40–42 in / 102–107 cm
   X-Large	42–44 in / 107–112 cm

   For a more relaxed fit or when wearing additional layers, sizing up may be preferable. A more athletic build with a larger chest and narrower waist may benefit from the smaller size when between measurements.

   What Is The Pemi 15 Best For?

   The Pemi 15 is designed primarily for fastpacking, mountain running, ultramarathons, technical trail running, and long days in the mountains where speed and accessibility are priorities.

   It’s particularly well suited to:

   • Fastpacking
   • Mountain running
   • Ultramarathons
   • Long-distance trail running
   • Technical mountain terrain
   • Alpine missions
   • Extended water carries
   • Trips requiring trekking poles or an ice axe

   With 15 liters of capacity, it’s large enough for an all-day kit while remaining compact enough to stay close to the body during high-output activities.

   Hyperlite Mountain Gear recommends keeping the carried load around 15 pounds for comfortable use, making the Pemi 15 better suited to efficient, carefully selected gear than heavy loads.

   The Tradeoff

   The Pemi 15’s biggest strength is also its defining limitation: it’s a specialized high-output pack rather than a general-purpose backpack.

   At 15 liters, storage space is intentionally limited. If you’re carrying a large amount of clothing, camping equipment, or bulky gear, you’ll quickly reach the pack’s capacity.

   The vest-style harness also prioritizes a close, secure fit over the adjustability and load distribution of a traditional backpacking pack.

   But that’s the point. The Pemi 15 isn’t trying to replace a 40- or 55-liter backpack. It’s designed for situations where you want to carry a relatively small amount of gear quickly and comfortably while keeping water, food, layers, and technical equipment immediately accessible.

   Rikkar Take

   The Hyperlite Mountain Gear Pemi 15 is a purpose-built pack for people who care as much about how their gear moves as how much it weighs.

   At 12.4 ounces, it’s exceptionally light for a structured 15-liter pack, but the real appeal is the combination of the vest harness, welded back panel, and highly accessible storage.

   The full-connection harness keeps the load close to the body and helps minimize bounce, while the ALUULA® 97 construction provides a combination of durability, water resistance, and low weight. The numerous front pockets also mean that food, water, and other frequently used gear can stay within reach rather than buried inside the main compartment.

   We especially like the Pemi 15 for fastpacking and technical mountain days. The integrated trekking pole and ice axe carry systems make it more capable than a typical running vest, while the 15-liter capacity provides enough room for the additional layers and equipment that longer or more remote outings demand.

   It’s not a pack for carrying everything. It’s a pack for carrying exactly what you need and moving efficiently with it.

   For fastpackers, mountain runners, and anyone who spends long days moving quickly through technical terrain, the Pemi 15 is a compelling example of how a running vest and ultralight backpack can be combined into a single, highly focused system.