Zpacks Arc Haul Ultra 40L: Women's Ultralight Backpack Guide
By Zpacks | Level Up Your Next Adventure | Published: 2026-10-26
Category: Product Reviews
Discover if the Zpacks Arc Haul Ultra 40L is your ideal ultralight backpack. Get fit guidance, decision rules, and honest trade-offs for thru-hiking.
Quick Answer
The Zpacks Arc Haul Ultra 40L is a standout women's ultralight backpack for thru-hikers who prioritize comfort and durability, but it's not for everyone. Use our fit guidance and decision rules to see if it matches your needs.
Why the Arc Haul Ultra 40L Stands Out
The Arc Haul Ultra 40L is crafted from ultra-durable Ultra 100X fabric, balancing comfort and strength with barely-there weight. Its signature curved carbon fiber Arc Frame is designed to keep the pack off your back, improving airflow and comfort on long hikes.
This pack is specifically designed with women in mind, helping you carry with confidence. The women's-specific fit and adjustable options make it a versatile choice for many body types.
Trade-offs to Consider
While the Arc Haul Ultra 40L is a top contender, it may not suit everyone. The 40L capacity is ideal for ultralight thru-hikers but might feel restrictive if you prefer carrying more gear. Additionally, the curved frame requires a proper fit to maximize comfort, so take time to adjust it.
If you're between sizes or have a unique torso length, the fit options (torso, shoulder straps, belt length) are customizable, but you'll need to measure carefully.
Decision Rules: Is the Arc Haul Ultra 40L Right for You?
- Choose the 40L if: You're an ultralight thru-hiker or weekend backpacker who packs efficiently and wants a lighter load. The 40L capacity is perfect for a minimalist kit. Aim for a base weight under 15 lbs to make the most of the 40L size.
- Choose the Arc Haul Ultra if: You value a pack that keeps your back cool and comfortable. The curved carbon fiber frame provides excellent airflow and weight transfer. Test the frame adjustment to ensure it matches your torso curve for optimal comfort.
- Choose a different pack if: You need more than 40L of capacity for bulky gear, winter trips, or carrying a bear canister. Consider a larger Arc Haul Ultra model. Measure your gear volume before committing to a 40L pack.
Product Facts
- Women's Arc Haul Ultra 40L Backpack: Crafted from ultra-durable Ultra 100X fabric, this pack balances comfort and strength with barely-there weight. You get a pack that withstands trail abuse without weighing you down, making it ideal for long thru-hikes.
Women's Arc Haul Ultra 40L Backpack - Women's Arc Haul Ultra 40L Backpack: The signature curved carbon fiber Arc Frame keeps the pack off your back, improving airflow and comfort. Reduced back sweat and pressure points mean you can hike longer in comfort, especially in warm weather.
- Women's Arc Haul Ultra 40L Backpack: Designed with women in mind, it helps you carry with confidence. The women's-specific design ensures a better fit and weight distribution, reducing strain on your shoulders and hips.
Fit Guidance: Who Should Get the Arc Haul Ultra 40L?
Best for
- Ultralight thru-hikers who prioritize comfort and durability
- Women with a torso length that fits the adjustable range and who prefer a curved frame
Not for
- Hikers who carry heavy or bulky loads exceeding 40L capacity
- Those who prefer a more traditional, rigid frame or need a pack with a separate sleeping bag compartment
