Zpacks Arc Haul Ultra 40l backpack - is designed for long days on the trail, with ample space and durability for carrying essential gear. It is made from Ultra 100X material, known for being both ultralight and tough. The backpack features a roll-top closure to keep water out, adjustable shoulder straps, and a customizable belt. Its side pockets are specifically designed to fit water bottles or soft bladders, with elastic tops for a snug fit. Additionally, the pack includes a large mesh center pocket for easy access and drying wet clothes.

The Arc Haul Ultra’s frame uses Curved Carbon Fiber Air Stays combined with a Lycra back panel, creating a gap between the user’s back and the pack for airflow and comfort. This design helps keep the back cool while hiking and prevents gear from rubbing uncomfortably. The belt is securely attached to the bottom of the frame, allowing for effective weight transfer to the hips. The V-Style webbing on the belt lets users adjust it to wrap more securely around their hips, with load lifter straps to further enhance comfort and fit.

With a capacity of 40 liters, the backpack is suited for 3 to 4 days of food and ultralight gear. The side compression straps help reduce the pack's volume when less space is needed, while the top and base straps can be used to attach additional gear for longer hikes. The Arc Haul Ultra is also compatible with bear canisters, and the design allows it to fit inside an airplane overhead bin for the short and medium sizes, making it versatile for various adventures.

The backpack’s innovative design extends to the patented torso height adjustment system, allowing users to fine-tune the fit according to their height or share the pack with others. The construction includes durable stitching, a highly water-resistant exterior. Overall, the Arc Haul Ultra is built for endurance and comfort, making it suitable for demanding hikes and extended outdoor expeditions.

SIZE AND VOLUME

- Load Capacity: Holds up to 18 kg.

- Body Dimensions: 12.75 cm (width) x 31.8 cm (depth) x 74 cm (height).

- Volume: Total 40L (28L main body, 2L each side pocket, 8L center pocket).

MATERIAL

- Ultra 100X Fabric: Weighs 112 g/m², waterproof with a >20,000 mm H₂O rating, and offers tear strength of 31.5 kg (warp) and 40.7 kg (fill). It’s highly durable and abrasion-resistant, with an "X" grid for added strength.

- Mesh: Weighs 119 g/m², used for backpack center pockets, durable against abrasion and tearing, with 4 mm hole size for breathability.

- Lycra® Mesh: Weighs 170 g/m², 4-way stretch, used for back panels, providing flexibility and tear resistance.

- 3D Spacer Mesh: Weighs 180 g/m², 2.5 mm thick, used for shoulder straps and belts, allowing airflow, cushioning, and grip.

FEATURES

• The Ultra fabric is made from Ultra High Molecular Weight Polyethylene (UHMWPE), offering superior tear and abrasion resistance, while being PFAS-free and chemical-free.

• Curved Carbon Fiber Air Stays and a Lycra back panel create an air gap for ventilation, keeping your back cool and preventing gear from rubbing against you during hikes.

• The roll-top closure, along with taped seams, makes the pack highly water-resistant, ideal for keeping gear dry and compressing as your load decreases.

• Padded shoulder straps (9.5 mm thick, 7 cm wide) and belt, both featuring 3D mesh for cushioning and grip, come with daisy chains and an adjustable sternum strap for added comfort.

• Side pockets can hold 1–1.5L bottles or 2L soft bladders, positioned for easy access with elastic tops and drainage holes.

• Side compression straps and optional top/base straps allow for pack volume adjustment, while accommodating extra gear like trekking poles or umbrellas.