Women's Arc Haul Ultra 40L Backpack
I absolutely love this pack. Its super comfortable and super light!
The Arc Haul Ultra is your trail-tested partner for epic thru-hikes and everyday escapes. Crafted from ultra-durable Ultra 100X fabric, this powerhouse of a pack balances comfort and strength with barely-there weight.
Designed with women in mind, it helps you carry with confidence. Our signature curved carbon fiber Arc Frame transfers weight to your hips and creates a breathable space between your back and the pack. No more sweaty discomfort during long climbs or hot days.
With a patented adjustable torso height, interchangeable shoulder straps, and a padded belt that hugs your shape, the Arc Haul Ultra isn’t just made to fit, it’s made to fit you. Add modular accessories to suit your adventure style and you’re ready to take on big miles with comfort, grace, and grit.
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- The Women’s Arc Haul Ultra 40L offers the same design, ultralight performance and rugged durability as our standard version. While the pack is built to fit a wide range of hikers, many women prefer the Small/Women’s shoulder straps, which offer a narrower, more contoured fit for enhanced comfort and support where it matters most.
- Made from 3.3 oz/sqyd Ultra 100X fabric, a woven blend of Ultra High Molecular Weight Polyethylene (UHMWPE) that’s stronger than steel and almost lighter than air. It resists abrasions, tears, and rough trails like a pro.
- Ultra fabric is naturally waterproof and free from PFAS, DWR, and harsh coatings—so you can breathe easy knowing your gear is eco-conscious and safe.
- All seams and attachment points are taped making the pack highly water resistant. Add dry bags or a pack liner for peace of mind when the skies open up.
- Our women-friendly Arc Frame curves naturally away from your back, leaving a cooling air gap. It prevents that sweaty pack feel and keeps your gear from digging in. Plus, it transfers weight to your hips helping your hike feel effortless.
- With 40L of volume, it’s ideal for 3-4 day adventures with ultralight gear. Lash on extras with the included top strap and base straps on longer carries. Roll down the top and cinch down the sides to compress the volume on short trips. Shorter hikers may prefer a larger volume pack with the top rolled down so that it doesn't stick up so high above their shoulders.
- Side compression cords let you cinch things down or carry extra essentials like trekking poles or an umbrella standing in the side pockets.
- Choose your ideal strap style—each one padded with comfy 3/8" closed-cell foam and breathable 3D mesh underneath to soften the load. An adjustable sternum strap and daisy chains let you tailor the fit and clip on must-haves.
- Our interchangeable padded hip belt features V-style webbing that hugs the contours of your body—more secure, and more comfortable than traditional belts. It’s built to move with you, not against you.
- Each side pocket holds up to two 1L bottles and is angled for easy reach. No need to take off your pack to stay hydrated. The pockets have drainage holes and snug elastic at the top.
- Store wet gear, or quick access items in the large stretchy mesh center pocket. Let wet gear dry while you move forward.
- A drinking tube can be threaded out the corner of the roll top closure and just secured using the daisy chain on your strap.
- All standard Bear Canisters will fit in the upper half of this pack standing on end. Use your sit pad and clothing as padding around the canister to fill out the space.
- The short and medium frames fit in most airplane overhead bins.
- The shoulder straps can be adjusted up or down for a perfect fit using our patented torso adjustment mechanism. It works like a conveyor belt. This is great for sharing the pack between people, or for growing teenagers.
- Our torso height adjustment mechanism is is covered by US Patent No. 9,848,687. Our Flexed Arc Frame is covered by US Patent No. 9,060,590.
- All Zpacks gear has a two year limited warranty against defects in materials or workmanship. Please see our return / warranty policy.
- Designed and assembled in the USA from domestic and imported components.
Load Capacity:
30-35 lbs (14-16 kg) comfortably, 40 lbs (18 kg) max.
Body dimensions:
5" x 12.5" x 29" (12.75 cm x 31.8 cm x 74 cm)
Volume:
40L (27L main body, 2.5L each side pocket, 8L center pocket)
Frame Height:
Short 17" (43 cm) | Medium 20" (51 cm) | Tall 23" (58 cm)
Torso Height:
To measure your torso height, you will need the help of a friend and a string or cloth tape measure.
The position you like your belt to sit makes a huge difference. Some people put their belt below their pelvic crest on their hips, others wear it on their pelvic crest, or above it depending on their body shape.
To ensure you lock in the perfect fit, we suggest putting a belt on over your clothes in the spot where you’d like it to ride. Start your measurement at the center of the belt where it meets your spine.
Lower your chin towards your chest. This will cause the C7 vertebrae to protrude at the base of your neck. The C7 vertebrae will mark the top of your torso height measurement.
Using the string or cloth tape measure, follow the curve of your spine up from the center of your belt to your C7 vertebrae. This measurement is your torso height.
Most adults fit our medium adjustment range. If in doubt try a medium. Make sure to load up the pack when trying it on. Exchanges are ok.
Belt Size:
The padded portion of the belt is 1" shorter than the listed minimum adjustment. For example a "Medium (30-35 inches)" belt has padding which measures about 29" tip to tip, and has a minimum adjustment circumference of 30". It is the recommended size if your actual measurement is up to 35". The webbing extends further for adjustment.
To measure your belt size, pull a string or cloth tape measure tight around the spot you’d like your belt to ride. Choose a belt with a minimum adjustment of a couple inches smaller than your actual waist measurement. This will leave room for you to tighten down the belt if you lose a little weight on trail.
The belts on our Arc backpacks are removable and interchangeable. This gives you the ability to switch the belt out if your waist size changes or if you order the incorrect size by mistake.
Shoulder Straps:
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Standard Straps Comfy 2.75" wide contoured shoulder straps made with 3/8" closed cell foam and 3D mesh on the underside for cushion and breathability. The straps have a daisy chain for clipping on items like our popular shoulder pouches, shoulder pouches w/ zipper, water bottle sleeves. An adjustable position sternum strap is included, as well as load lifter straps to help pull the backpack in over your shoulders. |
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Small/Women's Straps |
Arc Haul Add-Ons
Multi-Pack
Really appreciate the ability to carry it different ways and to carry it alone on days in town. Saves much time and aggravation as you can get to most things you need during your hike when carried on your chest.
This versatile four-in-one backpack accessory is one of our most popular items. The ability to choose between four different configurations helps make the Multi-Pack the perfect companion for just about any adventure.
Need a spare set of Multi-Pack straps? Click here.
Check out more of our Backpack Add-Ons.
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