Zpacks Arc Blast

The Zpacks Arc Blast is a 55 L ultralight thru-hiking pack weighing 565 g, built around a removable carbon Arc Frame and a tensioned mesh back panel that holds the load off your back for better airflow. The body is 3.1 oz/sqyd Dyneema Composite Fabric Hybrid, a material that resists water and holds its shape over years of use. The 55 L capacity (42 L main body plus 13 L external pockets) closes with a roll-top, backed by a front pocket, two side pockets, a daisy chain, and side loops for trekking poles. The hip belt is padded, removable, and adjustable across 61–112 cm, while back length adapts to a 43–66 cm torso — enough spread for most body sizes. Rated to 16 kg and weighing well under 600 g, its volume-to-weight ratio sits among the best in the category. Built for thru-hiking and multi-day trekking where every gram adds up, the pack lacks the rigid frame and structured back support of heavier touring packs, so comfort near the top of its load rating depends on careful, compression-conscious packing.