Mountainsmith

Zerk 13 Backpack w/2L Bladder

What Our Gearhead® Experts Are Saying:

"I’ve taken the ZERK 13 on long, steep days, and the suspension makes a big difference for such a small pack. The wide straps distribute weight well, and the included bladder is legit one of the easiest to drink from. Everything stays accessible without digging around."

Steep climbs and rolling ridgelines demand efficiency, and the Zerk 13 Backpack w/ 2L Bladder from Mountainsmith supports that pace with a stable, hydration-forward design. The wide shoulder straps spread load comfortably while stash pockets keep soft flasks, snacks, or gloves within reach. Inside, a large panel loader section organizes up to 13 liters of gear, with the 2L bladder secured in its dedicated sleeve for reliable water access on demanding routes.

A removable interior frame sheet adds structure when we’re carrying more, while angled bottle pockets and front panel storage adapt to changing needs. Daisy chains and stretch mesh create flexible lashing options for layers or poles, and the padded waistbelt with dual pockets refines fit on varied terrain. With its bright interior and quick-access layout, the ZERK 13 keeps momentum high from trailhead to summit.