Zpacks Arc Haul Ultra

The curved carbon fiber frame pushes the pack away from your back, creating a ventilated air gap that significantly reduces sweat buildup. It also acts as a tensioning system, effectively transferring the weight of your gear to your hips rather than letting it sag against your spine.

Yes, Ultra 100X is an exceptionally high-performance material known for its high abrasion resistance and tear strength relative to its weight. While it is ultralight, it is designed to withstand the rigors of long-distance trekking and is significantly more durable than standard lightweight nylon fabrics.

Absolutely. The pack features an adjustable torso height system, allowing you to slide the shoulder strap attachment point up or down to dial in the perfect fit for your specific back length.

Yes, the pack is designed with modularity in mind. You can swap out both the shoulder straps and the hip belt for different sizes, ensuring you can achieve a precise fit even if your body shape changes or if you prefer a different strap configuration.

While the Ultra 100X fabric is highly water-resistant and the seams are taped, Zpacks recommends using a pack liner or dry bags for your gear inside. It will handle rain and trail moisture well, but it is not considered a submersible dry bag.

The 40L capacity typically refers to the main internal compartment. The external pockets—like the large mesh front pocket and side pockets—provide significant additional storage space, making the total carry capacity higher than the main volume suggests.