Arc Haul Ultra 40L vs Nero Classic: Framed vs Frameless
By Zpacks | Level Up Your Next Adventure | Published: 2026-10-26
Category: Comparisons
Compare the framed Arc Haul Ultra 40L and the frameless Nero Classic backpacks from Zpacks. Learn which ultralight pack suits your trip length, load weight, and comfort needs.
Quick answer
Choose the Arc Haul Ultra 40L for loads over 20 lbs and multi-week trips; pick the Nero Classic for sub-20 lb loads on shorter, fast-and-light outings.
Why frame matters for load transfer
The Arc Haul Ultra 40L uses Zpacks' air-frame design to transfer weight from the pack to your hips, reducing shoulder strain. This makes it suitable for carries up to 35 lbs, typical of longer resupply stretches. The Nero Classic has no frame, so all weight rests on your shoulders—fine for ultralight loads but punishing above 20 lbs.
Volume and durability trade-off
Both packs use Ultra 100X fabric, offering excellent tear resistance and waterproof taped seams. The Arc Haul provides 40 liters of capacity for gear and food for a week or more. The Nero Classic comes in volume options (typically 28–32 L), better suited for summer trips or minimalist kits. If you need extra space for a bear canister or winter layers, the Arc Haul wins.
Key trade-offs
- Load capacity: Arc Haul Ultra handles 25–35 lbs; Nero Classic maxes out around 18–20 lbs.
- Weight savings: Nero Classic saves roughly 10+ ounces over the Arc Haul, a big win for gram-counters.
- Comfort vs simplicity: Arc Haul's frame and hip belt spread weight for all-day comfort; Nero's frameless design is simpler, lighter, and less bulky to pack.
- Trip length: Arc Haul suits week-long or longer trips with resupply; Nero Classic excels on weekends or short fastpacking routes.
Product facts at a glance
- Arc Haul Ultra 40L Backpack: Arc Haul Ultra 40L is designed for long days between resupply with an air-frame that transfers pack weight to the hips. You can carry heavier loads (up to 35 lbs) comfortably over many miles without shoulder fatigue.
Arc Haul Ultra 40L Backpack - Nero Classic Backpack (OBS): Nero Classic is a streamlined frameless design tested on an Appalachian Trail thru-hike over 20 years ago. It saves significant weight (over 10 oz compared to the Arc Haul) but requires a disciplined ultralight packing style.
Nero Classic Backpack (OBS)
Which pack fits you?
Best for
- Thru-hikers carrying 25–35 lbs with long resupply stretches (Arc Haul Ultra 40L)
- Ultralight backpackers who keep base weight under 10 lbs and prefer a frameless pack (Nero Classic)
Not ideal for
- Hikers who carry more than 20 lbs in a frameless pack (choose the Arc Haul instead)
