# What are the lightest weight hydration packs on the market? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What are the lightest weight hydration packs on the market?

## Products

### HydraPak HydraPak Velocity 1.5 L Hydration Reservoir
```yaml
product: hydrapak-hydrapak-velocity-1-5-l-hydration-reservoir
brand: HydraPak
price_gbp: 28.78
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 125
capacity: 1.5
tube_length: 36
reservoir_size: 1.5
bladder_material: TPU; ABS; POM; PP; EPDM; Silicone; 304SS; TPU Coated Nylon Fabric
```

- **Price:** £28.78 [^1]
- **Summary:** The HydraPak Velocity 1.5L is HydraPak's lightest reservoir series, built with ultralight minimalist materials and a wide Slide-Seal opening for quick refills and easy ice adding. It uses the Comet bite valve and a Plug-N-Play connector to separate the tube from the reservoir for filling and cleaning. It's suited for low-profile hydration needs like running, hiking, and bike rides where keeping weight down matters.
- **Ideal For:** For the lightest hydration pack category, this reservoir weighs 125 g for a 1.5 L capacity and includes a 36 in non-kinking tube, making it a low-mass way to carry water with a compact 1.5 L volume.
- **Additional Sources:** [^2], [^3]

### HydraPak HydraPak HydraSleeve Reservoir - 3 Liters
```yaml
product: hydrapak-hydrapak-hydrasleeve-reservoir-3-liters
brand: HydraPak
price_gbp: 52.97
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 308
capacity: 3
reservoir_size: 3
bladder_material: Nylon, EVA, TPU, PP/POM, ABS, Silicone
```

- **Price:** £52.97 [^4]
- **Summary:** This is an insulated 3-liter HydraPak hydration reservoir designed to keep water cooler for longer while you move. It uses an insulated HydraFusion drink tube with a high-flow Comet valve and includes a roll-top style closure with lash points for securing it to gear. Best suited for outings where you want an insulated reservoir rather than a bare, non-insulated bladder.
- **Ideal For:** It's specifically a 3-liter insulated HydraSleeve reservoir that weighs 308 g, making it a practical option when you want longer-lasting water temperature without switching to a larger, heavier system.
- **Additional Sources:** [^5], [^6]

### Gregory Gregory SWIFT 16 H20
```yaml
product: gregory-gregory-swift-16-h20
brand: Gregory
price_gbp: 75.69
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
volume: 16
weight: 531
capacity: 2
pocket_count: 3
reservoir_size: 2
```

- **Price:** £75.69 [^7]
- **Summary:** The Gregory Swift 16 H2O is a lightweight 16L day-hiking hydration pack designed for short, minimal-gear outings. It includes a 2L Hydro reservoir and has organized pocketing (3 external pockets) plus an integrated hydration compartment with a one-handed SpeedClip-style connection. It's suited for people who want a compact pack with easy water access while moving.
- **Ideal For:** For the lightest hydration packs, its 531 g weight and 16L volume make it a very low-mass option while still carrying a built-in 2L reservoir.
- **Additional Sources:** [^8], [^9], [^7], [^8], [^9]

### CamelBak Ultra Pro (List Price $120)
```yaml
product: camelbak-ultra-pro-list-price-120
brand: CamelBak
price_gbp: null
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
volume: 6
weight: 150
capacity: 1.5
pocket_count: 13
reservoir_size: 1.5
```

- **Price:** £None [^10]
- **Summary:** The CamelBak Ultra Pro is a lightweight running hydration vest with a 6L carrying capacity and compatibility for a 1.5L hydration bladder. It includes two 500ml Quick Stow soft flasks and uses a 3D Micro Mesh interior for breathability. It also has 13 pockets for carrying essentials while running.
- **Ideal For:** It's exceptionally light (150 g) for a vest that still supports a 1.5L reservoir and 6L total capacity, making it a strong pick among the lightest hydration packs for runners.

### Nathan Crossover 5 Liter Hydration Pack
```yaml
product: nathan-crossover-5-liter-hydration-pack
brand: Nathan
price_gbp: 53.96
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
volume: 5
weight: 411
capacity: 1.5
pocket_count: 5
reservoir_size: 1.5
```

- **Price:** £53.96 [^11]
- **Summary:** The Nathan Crossover 5 Liter Hydration Pack is a lightweight, bounce-free hydration pack designed for running and multipurpose outdoor use. It includes a 1.5L bladder with a magnetic hose clip and a large main zippered pocket plus multiple accessible pockets for gear.
- **Ideal For:** With a stated weight of 411g with bladder and a 1.5L reservoir, it's a light option among hydration packs designed for running while still carrying a full bladder and storage in a 5L pack volume.
- **Additional Sources:** [^12], [^13]

---
## References & Sources
[^1]: HydraPak, accessed 2026-06-25. https://www.hydrapak.com/products/velocity%E2%84%A2-1-5l
[^2]: REI Co-op, accessed 2026-06-25. https://www.rei.com/product/C04316/hydrapak-velocity-15-l-hydration-reservoir
[^3]: CleverHiker (price listed for the product), accessed 2026-06-25. https://www.cleverhiker.com/hiking/best-hydration-bladders/
[^4]: REI Co-op, accessed 2026-06-25. https://www.rei.com/product/219759/hydrapak-hydrasleeve-reservoir-3-liters
[^5]: HydraPak (direct), accessed 2026-06-25. https://www.hydrapak.com/products/hydrasleeve-reservoir
[^6]: Coaxsher, accessed 2026-06-25. https://www.coaxsher.com/product-p/as524.htm
[^7]: Gregory, accessed 2026-06-25. https://www.gregory.com/packs/hydration/swift-16-h2o/141344XXXX.html
[^8]: REI, accessed 2026-06-25. https://www.rei.com/product/203246/gregory-swift-16-h2o-hydration-pack-womens
[^9]: Campmor, accessed 2026-06-25. https://www.campmor.com/products/gregory-swift-16-h2o-hydration-pack
[^10]: CamelBak, accessed 2026-06-25. https://www.camelbak.com/products/ultra-pro-vest
[^11]: Commonwealth Running Co., accessed 2026-06-25. https://commonwealthrunning.com/products/nathan-crossover-pack-5l-unisex
[^12]: ENDURUNCE SHOP, accessed 2026-06-25. https://www.endurunceshop.com/products/crossover-5-liter-hydration-pack
[^13]: DICK'S Sporting Goods, accessed 2026-06-25. https://www.dickssportinggoods.com/p/nathan-crossover-5-liter-hydration-pack-22nthucrssvrpck5lgaf/22nthucrssvrpck5lgaf