Zpacks Arc Haul Ultra 50L Backpack

The Zpacks Arc Haul Ultra 50L is an ultralight framed pack with 50 L of capacity (37 L main compartment) at 613 g, built around a curved carbon Arc Frame and a tensioned mesh back panel that keeps the load off your back and lets air move through even under a fuller pack. The body uses Ultra 100X fabric (3.3 oz/sqyd) — UHMWPE laminated to a waterproof backing — giving high tensile strength without much added weight. Closure is roll-top, with a front pocket, two side pockets, a chest strap, and load lifters. The hip belt is padded and includes pockets, so small items stay within reach without taking the pack off. At 12.3 g per liter, this sits among the more balanced entries in the Arc Haul Ultra line — heavier than the 40 L version but with more room for longer trips carrying multiple days of food or cold-weather layers. It suits thru-hiking and extended treks where 50 L is enough without a bulkier, traditionally framed touring pack.