# What are the hydration packs with the best water reservoir capacity? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What are the hydration packs with the best water reservoir capacity?

## Products

### Gregory Citro 24 H2O
```yaml
product: gregory-citro-24-h2o
brand: Gregory
price_gbp: 66.4
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
volume: 24
weight: 916
capacity: 3
pocket_count: 5
reservoir_size: 3
```

- **Price:** £66.4 [^1]
- **Summary:** The Gregory Citro 24 H2O is a ventilated 24-liter hiking daypack with an included 3-liter 3D Hydro reservoir, magnetic bite-valve attachment, and alloy-steel frame. It suits hikers who want comfortable load support, organized storage, and substantial on-trail hydration for full-day outings.
- **Ideal For:** Its included 3-liter reservoir provides strong water capacity while the 24-liter pack volume, ventilated suspension, and five external pockets suit hikers carrying water and gear on longer day hikes.
- **Additional Sources:** [^2], [^3]

### Gregory Juno 24 H2O
```yaml
product: gregory-juno-24-h2o
brand: Gregory
price_gbp: 99.59
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
volume: 24
weight: 875
capacity: 3
pocket_count: 5
reservoir_size: 3
```

- **Price:** £99.59 [^4]
- **Summary:** The Gregory Juno 24 H2O is a women-specific day-hiking pack with a 24-liter load capacity, included 3-liter 3D Hydro reservoir, and ventilated VaporSpan back panel. Its lightweight frame, hipbelt pockets, magnetic hose clip, and trekking-pole attachment suit day hikers carrying gear for full-day trail outings.
- **Ideal For:** This pack suits hikers seeking the best water reservoir capacity because its included 3-liter reservoir provides the maximum capacity commonly offered in hydration packs while leaving 24 liters for hiking essentials.
- **Additional Sources:** [^5], [^6]

### Osprey Syncro 12
```yaml
product: osprey-syncro-12
brand: Osprey
price_gbp: 102.34
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
volume: 12
weight: 990
capacity: 2.5
pocket_count: 2 + main compartment
reservoir_size: 2.5
```

- **Price:** £102.34 [^7]
- **Summary:** The Osprey Syncro 12 is a 12-liter cycling hydration pack with an included 2.5-liter reservoir, breathable AirSpeed suspension, adjustable torso length, bike-specific harness, and deployable raincover. It suits mountain bikers and hikers who need substantial water capacity, organized storage, ventilation, and weather protection.
- **Ideal For:** With its included 2.5-liter reservoir and 12-liter pack volume, the Syncro 12 is well suited to shoppers seeking hydration packs with strong water reservoir capacity for longer rides and hikes.
- **Additional Sources:** [^8], [^9]

### Nathan Nathan VaporAir 3.0 7 Liter Hydration Pack - NS30390-60270
```yaml
product: nathan-nathan-vaporair-3-0-7-liter-hydration-pack-ns30390-60270
brand: Nathan
price_gbp: 132.82
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
volume: 7
weight: 227
capacity: 2
reservoir_size: 2
```

- **Price:** £132.82 [^10]
- **Summary:** The Nathan VaporAir 3.0 is a lightweight 7-liter hydration vest designed for breathable, comfortable all-day carry. It includes a 2-liter hydration bladder and features multiple storage areas including zippered pockets and an extended kangaroo pocket, plus side loops for trekking poles. It's well-suited to runners and hikers who want a stable, low-bounce vest with capacity for longer outings.
- **Ideal For:** For maximum hydration reservoir capacity, it includes a 2-liter bladder, which is larger than many small-run vests while keeping a 7-liter overall pack volume.
- **Additional Sources:** [^11], [^12]

### CamelBak CamelBak Crux 3L Reservoir - 3 Liters
```yaml
product: camelbak-camelbak-crux-3l-reservoir-3-liters
brand: CamelBak
price_gbp: 30.99
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 235
capacity: 3
reservoir_size: 3
bladder_material: Polyurethane
```

- **Price:** £30.99 [^13]
- **Summary:** This CamelBak Crux 3L reservoir provides 3 liters of high-flow hydration with an ergonomic handle for easier filling and an on/off lever at the bite valve to help prevent leaks. It uses HydroGuard antimicrobial technology and has a big bite valve that self-seals after each drink, and a quick-disconnect tube system for removing the reservoir for cleaning.
- **Ideal For:** If you want hydration packs with the best water reservoir capacity, this 3L Crux reservoir gives a full 3 liters in a single bladder, letting you carry more water for longer rides/hikes than smaller reservoirs.
- **Additional Sources:** [^14], [^15]

---
## References & Sources
[^1]: Gregory, accessed 2026-09-13. https://www.gregory.com/packs/hydration/citro-24-h2o/126894XXXX.html
[^2]: Jenson USA, accessed 2026-09-13. https://www.jensonusa.com/gregory-citro-24-h2o-backpack
[^3]: Blue Zone Sports, accessed 2026-09-13. https://www.bluezonesports.com/gregory/gregory-citro-24-h2o-hydration-63575
[^4]: Gregory, accessed 2026-09-13. https://www.gregory.com/packs/hydration/juno-24-h2o/126897XXXX.html
[^5]: REI, accessed 2026-09-13. https://www.rei.com/product/165346/gregory-juno-24-h2o-hydration-pack-womens
[^6]: Enwild, accessed 2026-09-13. https://www.enwild.com/gregory-juno-24-h2o-womens-2020.html
[^7]: REI Co-op, accessed 2026-09-13. https://www.rei.com/product/C02570/osprey-syncro-12-hydration-pack
[^8]: The Backcountry, accessed 2026-09-13. https://www.thebackcountry.com/osprey-synrco-12-hydration-backpack-w-25l-reservoi.html
[^9]: Airpark Bike Co, accessed 2026-09-13. https://www.airparkbikeco.com/products/osprey-syncro-12-hydra-pack-truffle-brown
[^10]: Altitude Sports, accessed 2026-09-13. https://www.altitude-sports.com/p/nathan-vaporair-30-hydration-vest-7l-mens-nat-ns30390
[^11]: Fleet Feet, accessed 2026-09-13. https://www.fleetfeet.com/products/mens-nathan-vaporair-3-0-7l-hydration-pack
[^12]: PR Run & Walk, accessed 2026-09-13. https://prrunandwalk.com/products/nathan-vaporair-3-0-7-liter-hydration-pack-ns30390-60270
[^13]: Excel Sports, accessed 2026-09-13. https://www.excelsports.com/camelbak-crux-3l-reservoir
[^14]: OutdoorXL, accessed 2026-09-13. https://canada.outdoorxl.com/camelbak-crux-3-ltr-reserv-100.html
[^15]: REI Co-op, accessed 2026-09-13. https://www.rei.com/product/108365/camelbak-crux-3l-reservoir-3-liters