Zpacks Arc Haul Backpack

The arc frame creates a physical gap between your back and the pack, which allows for significant airflow. It also acts as a suspension system that transfers the weight of your gear directly to your hips, reducing strain on your shoulders during long days of hiking.

Ultra 100X is highly abrasion-resistant and stronger than standard nylon fabrics of similar weight. While it is exceptionally tough for an ultralight pack, you should still exercise reasonable caution around sharp granite or dense, thorny brush to maintain the integrity of the material over time.

Yes, the pack features an adjustable torso height system that allows you to slide the shoulder harness up or down. This makes it easy to dial in a precise fit for your specific back length without needing any special tools.

The Ultra 100X fabric is water-resistant and the seams are taped, meaning it will handle light rain and splashes effectively. However, it is not fully submersible, so we recommend using a pack liner or dry bags for your critical gear during heavy or prolonged downpours.

Not at all. The arc frame is designed to keep the load close to your center of gravity while maintaining that ventilation gap. As long as you pack your heavier items closer to your back, the pack remains stable even on uneven or technical terrain.

Yes, the shoulder straps are designed to be interchangeable. This allows you to swap them out for different sizes or styles if you find that a different configuration better suits your body shape or carrying preferences.