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UltrAspire Altruist Hydration Pack
28 litres · 935g · Load-supporting waist belt
The UltrAspire Altruist is UltrAspire's largest running hydration pack, designed specifically for running while carrying substantial equipment loads. Part of the Pure Mountain Running range, it combines a close-fitting running-vest harness with a supportive waist belt and removable, cushioned semi-rigid frame to help distribute weight and maintain stability. It uses abrasion-resistant Challenge Cloth and reinforced EnduraMesh XT stretch fabric for durability without unnecessary weight.
At the rear, the large roll-top main compartment provides approximately 23 litres of storage within the pack's 28-litre total capacity. Its waterproof fabric helps protect clothing and equipment from wet conditions, while the roll-top allows the compartment to be overfilled when necessary, then rolled down and compressed as the load reduces. A large four-way stretch quick-stash pocket with external compression straps provides accessible storage for clothing and additional options for securing equipment to the outside. A central buckle strap allows bulkier items, such as snowshoes, rope or a sleeping mat, to be secured across the top. Removable lower straps with aluminium buckles offer another carrying position for equipment such as a foam sleeping pad. Two repositionable aluminium toggles at the top can be used for trekking poles, an ice axe or other equipment. An externally accessible, insulated reservoir compartment accommodates a compatible
2 litre hydration reservoir
(not included), with a port for routing the drinking tube.
On either side, exceptionally large four-way stretch pockets accommodate an
800ml soft flask
or larger bottles up to approximately 1.5 litres. Compatible soft flasks can be fitted with the
Bloddle Straw Attachment
for drinking without removing the flask from its pocket. Bidirectional side compression straps help stabilise the main load and retain items carried in the side pockets.
The front running-vest harness wraps around the body for comfort and stability, with a symmetrical arrangement of pockets that keeps hydration, food and essential equipment within reach while running. Two upper zipped pockets with sweat-resistant lining accommodate a GPS tracker, SPOT device or smaller valuables. Below these, two further zipped, lined pockets securely hold compatible
800ml soft flasks,
with openings for bite valves or
drinking straws.
Adjacent bungee attachments can retain hydration tubes or carry folded Z-poles across the chest. Two large outer pockets with bungee retention and two smaller side zipped pockets provide further accessible storage for food and essentials. Two vertically adjustable sternum straps allow the harness fit to be adapted to the runner and carried load.
The supportive waist belt has a tapered shape that allows the back of the pack to rise with the body's movement while the belt remains positioned lower around the hips. Tightening the belt helps transfer some of the carried weight towards the hips, reducing the load supported by the shoulders and upper body. Large zipped hip-belt pockets keep food, a phone, wrappers and other essentials immediately accessible. Together with the front harness storage, this allows the runner to reach much of what they need without repeatedly stopping to remove the pack.
Features
- Running-specific load support: Running-vest harness, supportive waist belt and cushioned back structure designed for carrying substantial equipment loads while running.
- Removable semi-rigid frame: Cushioned structural support can be removed to reduce weight when the additional support is not required.
- Challenge Cloth: Three-layer composite combining high-density polyester, UHMWPE fibre reinforcement and polyurethane film for high abrasion resistance at relatively low weight.
- EnduraMesh XT: Four-way stretch mesh combining Nylon 66 with 30% UHMWPE fibres for flexible, abrasion-resistant storage.
- Roll-top main compartment: Approximately 23 litres of main storage with waterproof fabric, an adjustable closure and capacity for additional equipment when required.
- Rear quick-stash pocket: Large four-way stretch external storage with compression straps that can also help secure additional equipment.
- Top equipment strap: Central buckle fastening secures bulkier items such as snowshoes, rope or a sleeping mat across the top of the pack.
- Removable lower straps: External carrying straps with aluminium buckles for equipment such as a foam sleeping pad.
- Movable aluminium toggles: Two removable, repositionable attachments provide alternative trekking pole, ice axe or equipment carrying positions.
- Rear hydration compartment: Externally accessible, insulated storage accommodates up to a 2 litre reservoir, with a drinking-tube routing port.
- Large side pockets: Two four-way stretch pockets accommodate 800ml soft flasks or larger bottles up to approximately 1.5 litres.
- Bidirectional side compression: Adjustable straps stabilise the main load and help retain items in the side pockets.
- Load-supporting waist belt: Tapered construction allows the pack to move with the back while the belt remains positioned lower around the hips.
- Hip-belt pockets: Large zipped pockets keep food, a phone, wrappers and other essentials accessible while running.
- Adjustable sternum straps: Two vertically repositionable straps with aluminium toggle fastenings.
- Upper harness pockets: Two zipped pockets with sweat-resistant lining for a GPS tracker, SPOT device or smaller valuables.
- Front hydration pockets: Two zipped, sweat-resistant lined pockets accommodate compatible soft flasks up to 800ml.
- Hydration ports: Openings allow bite valves or drinking straws to extend from the zipped flask pockets.
- Multifunction front bungees: Retain hydration tubes or provide horizontal carrying options for folded Z-poles.
- Outer harness pockets: Two large accessible pockets with bungee retention for hydration, food or equipment.
- Side zipped harness pockets: Two smaller pockets for food, wrappers and other essentials.
- Accessible running storage: Front harness and hip-belt pockets reduce the need to remove the pack to reach frequently used items.
Specifications
Total capacity:
28 litres
Main compartment:
Approximately 23 litres
Weight:
935g with frame
Weight without frame:
850g
Sizes:
SM/MD and MD/LG
Fit:
Adjustable running-vest harness with load-supporting waist belt
Back support:
Removable, cushioned semi-rigid frame
Main material:
Challenge Cloth, high-density polyester with UHMWPE reinforcement and polyurethane film
Stretch material:
EnduraMesh XT, Nylon 66 with 30% UHMWPE fibres
Main closure:
Roll-top with compression adjustment
Reservoir compatibility:
Up to 2 litres (not included)
Side bottle carry:
Up to approximately 1.5 litres per pocket
Front zipped bottle carry:
Up to 800ml per pocket
Hydration included:
None
External equipment carry:
Top buckle strap, removable lower straps, compression straps and repositionable aluminium toggles
Need help choosing?
For information about UltrAspire running vests and hydration packs, see our
UltrAspire pack guide.
If you are deciding how much carrying capacity you need, see our
Running Backpacks, Race Vests & Hydration Packs Guide.
Capacity should be considered alongside mandatory kit, aid-point spacing, water availability, weather, pace, access to crew and your preferred carrying strategy, rather than race distance alone.
If you are unsure about sizing, hydration setup or whether the Altruist provides the right capacity and support for your ultra-running kit,
get in touch
for straightforward advice.
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