




We offer free standard shipping to every province and territory in Canada.
We offer free standard shipping to every province and territory in Canada. No minimum purchase is required, and all orders include tracking for your convenience.
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.
Deliveries to Canada’s outer and remote regions may experience seasonal delays caused by severe weather or limited carrier availability. We appreciate your patience and recommend allowing additional time for your order to arrive safely.
Meet the Mountainsmith Zerk Ultralight Backpack, a 40 liter pack designed for thru hikers and outdoor explorers who value lightness without sacrificing storage. With an empty weight near 1.9 pounds and a compact footprint of 22 inches by 14 inches by 10 inches, it blends nimble movement with ample space for multi day gear.
The main compartment holds up to 40 liters of gear, while the side water bottle pockets feature angled openings for easy reach as you move. A roomy front mesh pocket provides a dedicated spot for bulky items, and the large mesh side stash pockets stay accessible from either side.
Roll top closure with side compression SR buckles lets you adapt packing to your load. The opposing SR buckles enable a self closing roll top, while reflective screen printing and cord loops boost visibility in low light. The front cord loops are compatible with the included bungee cord for extra gear securing options.
A 1.5 inch removable waistbelt helps stabilize the load, with a maximum waist size of 48 inches. The torso range runs 16 to 19 inches, and side compression straps secure the load from top to bottom. A removable interior laser cut frame sheet (EVA Atilon) provides rigidity while promoting airflow against the back.
Whether you are tackling a long ridge or a rugged approach, the Zerk Ultralight balances weight, capacity, and accessibility. These features are designed to support your personal trail rhythm and planning, offering possibilities for lighter gear setups and flexible packing depending on your route.
Q: What is the capacity and weight of the Mountainsmith Zerk Ultralight Backpack?
A: 40 liter capacity with 1.9 lb empty weight, designed for lightweight travel.
Q: How is the Zerk sized for different users?
A: Torso range 16 to 19 inches and a waistbelt up to 48 inches for a customizable fit.
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.
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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