Mountainsmith Zerk Ultralight Hiking Backpack 40L | Lightweight Thru-Hiking Pack
Meet the Mountainsmith Zerk Ultralight Backpack Designed for thru-hiking and fast-moving adventures, the Zerk balances weight, volume, and access. It...
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Mountainsmith
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Description
xMeet the Mountainsmith Zerk Ultralight Backpack
Designed for thru-hiking and fast-moving adventures, the Zerk balances weight, volume, and access. It weighs about 1.9 lb when empty and offers a generous 40-liter capacity. Its compact footprint measures 22 inches tall by 14 inches wide and 10 inches deep, helping you maintain a balanced load on long days on the trail.
Key storage and access
The pack places gear where you need it most: a large main compartment for core items, expansive side pockets, and a front mesh panel for bulky gear. Angled side water bottle pockets are built for quick, one-handed hydration while you stay moving.
- 40 liter main capacity for flexible packing
- Angled side bottle pockets for easy access
- Front mesh pocket ideal for bulky items
- Large mesh side stash pockets for quick reach
Security and closure
The roll-top closure uses SR buckles to create a self-closing top, helping you secure items on uneven terrain. Reflective screen printing enhances visibility in low light, and cord loops offer additional attachment options. A bundled bungee cord provides on-the-go compression when needed.
- Roll-top closure with side compression SR buckles
- Self-closing top for quick adjustments
- Reflective details improve visibility
- Cord loops with included bungee for flexible management
Comfort, fit, and load management
The Zerk is designed to fit a range of bodies. It features a removable 1.5-inch waistbelt and a torso range of 16 to 19 inches, along with side compression straps to stabilize the load. A removable interior laser-cut frame sheet (EVA Atilon) adds rigidity while promoting airflow. The backpack is optimized for carrying up to about 30 lb, balancing efficiency with stability on the trail.
- Removable 1.5” waistbelt; waist up to 48”
- Torso range 16”–19”
- Removable interior frame sheet for structure and airflow
- Side compression straps to secure the load
Whether you’re planning remote routes or longer weekend trips, the Zerk Ultralight Backpack combines weight savings with practical organization, helping you focus on the journey ahead without overburdening your pack.
FAQ
Q: What is the capacity and weight of the Mountainsmith Zerk Ultralight Backpack?
A: 40 liters of gear space, with a 1.9 lb empty weight.
Q: What features support organization and comfort on trails?
A: Large main compartment, side pockets, front mesh pocket, roll-top closure, adjustable waistbelt, and removable frame sheet aid load management.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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