Mountainsmith Zerk 40 Backpack Color:Black UVC and harmful blue light

UVC and harmful blue light up to 400mm

In-mold shell construction fuses a lightweight polycarbonate shell with an EPS liner for a low-profile fit

You'll never regret having a pair close by

This unique design removes the bulky seam and materials between your fingers

5 deployable webbing compression straps

Mountainsmith Zerk 40 Backpack Color:Black UVC and harmful blue lightCo designed with The Real Hiking Viking, a professional hike really long distances really quickly er, the ZERK 40 was born out of a need for an ultralight pack that can withstand the thousands of miles per year that The Real Hiking Viking already covers. We wanted to make sure that it would allow him to go farther, to hike longer, and to work more efficiently on the trail. Over the course of 2 years of development, the ZERK 40 went through 4