Mountainsmith Zerk 40 – Phantom

Description

Co‑designed with The Real Hiking Viking, one of the most prolific long‑distance hikers on the planet, the Mountainsmith Zerk 40 was refined over two years and more than 5,000 miles of testing in the Rockies. Now in its fifth‑generation evolution, it’s built with one mission: go faster, further and lighter.

Constructed from ultra‑light, ultra‑durable materials — including 210D EXTREEMA® recycled nylon ripstop (UHMPE) — the Zerk 40 is tough enough for thru‑hikes, yet streamlined for fastpacking and high‑output missions. A roll‑top closure, expansive mesh storage and angled side pockets keep gear accessible on the move, while the extra‑wide shoulder straps with integrated mesh pockets distribute weight comfortably during long days on trail.
A removable laser‑cut framesheet adds structure and airflow when needed, and the removable over‑top webbing straps secure a bear canister or extra gear. With dialled‑in organisation, exceptional accessibility and thru‑hiker‑tested comfort, the Zerk 40 is built to be your most reliable trail companion.

Features
• 1.5″ removable waistbelt for adaptable carry
• Large main compartment holds up to 40 L of gear
• Roll‑top closure with side‑compression SR buckles and opposing SR buckles for self‑closing function
• Side compression straps for stabilising the load
• Large angled side water‑bottle pockets for easy on‑the‑go access
• Expansive front mesh pocket for bulky or wet gear
• Large mesh side stash pockets with angled openings
• Reflective screen printing and cord loops for low‑light visibility
• Front cord loops compatible with included bungee cord
• Removable interior laser‑cut framesheet (EVA Atilon) for rigidity and airflow
• Extra‑wide EVA‑padded shoulder straps with adjustable sternum strap and safety whistle
• Four large mesh front pockets on shoulder straps (two per side)
• Removable over‑top webbing straps for securing a bear canister or accessories
• Front‑panel bungee attachment system for overflow storage

Materials
• Body: 210D EXTREEMA® recycled nylon ripstop (UHMPE)
• Reinforcements: Recycled 210D nylon SD Oxford
• Pockets: Nylon stretch mesh
• Frame: Removable EVA Atilon laser‑cut framesheet

Specifications
• Volume: 32 L (roll‑top compressed) / 40 L (fully extended collar)
• Dimensions: 47.0 × 29.8 × 14.6 cm
• Weight: 0.82 kg with accessories / 0.77 kg without accessories