The Zpacks Arc Haul 40L is an astounding design based on the fact that it has a full external frame and still weighs less than 20 oz thanks to Challenge ULTRA fabric. It has the best weight transfer of all sub-20-oz packs.

• Weight: 19.4 oz
• Price: $399
• Materials: Challenge ULTRA 200
• Frame: External Carbon Fiber Frame, lycra back panel.
• Load Capacity: 40 lbs
• Internal Volume: 25L
• External Volume : 13L
• Pros: Ultralight. Great external storage. Waterproof fabric. Wide Shoulder Straps. Full-frame weight transfer. Load lifters. Adjustable torso height.
  
• Cons: Frame could be more durable. Hip belt pockets sold separately. Expensive.

 

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Features

What stands out the loudest about the Zpacks Arc Haul 40 is the exposed “external” curved carbon fiber air stay frame and taught lycra back panel. This mechanically transfers weight to the hips while also holding the lycra in place that creates an air gap between you and the inside of the pack. Thus reducing sweat/venting heat. Lastly, the frame includes a patented torso height adjustment mechanism.

Another loud feature is the best-in-class Challenge ULTRA 100 or 200D fabric used in the construction. It’s waterproof, ultralight, and preposterously durable relative to its weight.

Thirdly, we just adore the full size mesh back pocket with slack for extra storage space. Arc Haul 40 also comes with 2 full size side pockets, and a nice wide hip belt with pockets sold separately. It’s finished off with various external straps on the top, bottom, and upper sides.

Verdict

The Zpacks Arc Haul 40 has best-in-class weight transfer, waterproof/hyper-durable Challenge ULTRA fabric, and excellent pockets. It is the perfect fastpacking backpack for high mile trips that require heavy food bags.

 

Compare to more models in our guide to the best fastpacking backpacks.