# Which hiking backpack has the largest capacity for multi-day trips? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

Which hiking backpack has the largest capacity for multi-day trips?

## Products

### Hyperlite Mountain Gear Porter 85
```yaml
product: hyperlite-mountain-gear-porter-85
brand: Hyperlite Mountain Gear
price_gbp: 349.18
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 42.4oz
capacity: 85L
material: DCH150 body + DCHW bottom
number_of_pockets: 3
adjustable_torso_length: 15in-17in, 17in-19in, 19in-21in, 21in+
```

- **Price:** £349.18 [^1]
- **Summary:** The Porter 85 is a lightweight, waterproof expedition pack with an 85L dry-bag-style main compartment, removable aluminum stays, compression straps, and modular daisy chains. It suits climbers, mountaineers, skiers, packrafters, and other users carrying bulky gear on extended trips.
- **Ideal For:** It is a strong choice for multi-day trips requiring the largest capacity because its 85L main compartment is the largest capacity in the Porter range, while its 42.4oz weight and waterproof Dyneema construction keep the pack relatively light and weather-resistant.
- **Additional Sources:** [^2]

### Hyperlite Mountain Gear Southwest 70
```yaml
product: hyperlite-mountain-gear-southwest-70
brand: Hyperlite Mountain Gear
price_gbp: 290.37
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 35.6 oz white; 36.0 oz black
capacity: 70L
material: Dyneema Woven Composite 3.9, Hardline
number_of_pockets: 3 + main compartment
hydration_compatible: true
adjustable_torso_length: Fixed lengths: 15-17 in, 17-19 in, 19-21 in, 21+ in
```

- **Price:** £290.37 [^3]
- **Summary:** The Southwest 70 is a lightweight 70L backpack with waterproof Dyneema Woven Composite fabric, three durable exterior pockets, a roll-top closure, and removable aluminum stays. It suits hikers carrying substantial loads on multi-day, thru-hiking, off-trail, and extended backcountry trips.
- **Ideal For:** It suits multi-day trips because its 70L capacity is the largest Southwest size, with 16L of external storage, a load capacity of up to 60 lbs, and hydration compatibility.
- **Additional Sources:** [^4], [^5]

### Zpacks Arc Haul 70
```yaml
product: zpacks-arc-haul-70
brand: Zpacks
price_gbp: 293.31
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 22.2 oz / 630 g
capacity: 70 L
material: Ultra 100X
number_of_pockets: 3
hydration_compatible: false
adjustable_torso_length: 16-26 in
```

- **Price:** £293.31 [^6]
- **Summary:** The Zpacks Arc Haul 70 is an ultralight 70 L backpack made from durable, water-resistant Ultra 100X fabric. Its curved carbon fiber frame, ventilated back panel, roll-top closure, and adjustable torso system suit ultralight hikers carrying gear for extended trips between resupplies.
- **Ideal For:** It suits multi-day trips requiring the largest capacity because its 70 L volume accommodates substantial food, water, and ultralight gear, including a BearVault 500 carried horizontally.
- **Additional Sources:** [^7]

---
## References & Sources
[^1]: Packraft Adventure, accessed 2026-08-28. https://www.packraftadventure.co.uk/product-page/porter-85
[^2]: Alpine Ascents, accessed 2026-08-28. https://www.alpineascents.com/product/porter-85/
[^3]: Hyperlite Mountain Gear, accessed 2026-08-28. https://hyperlitemountaingear.com/products/southwest
[^4]: REI Co-op, accessed 2026-08-28. https://www.rei.com/product/C02643/hyperlite-mountain-gear-southwest-70-pack
[^5]: Outdoorline, accessed 2026-08-28. https://www.outdoorline.eu/products/hyperlite-mountain-gear-southwest-70
[^6]: Zpacks, accessed 2026-08-28. https://zpacks.com/products/arc-haul-ultra-70l-backpack
[^7]: Outdoorline, accessed 2026-08-28. https://www.outdoorline.eu/products/zpacks-arc-haul-ultra-70l