This is a preview of a member exclusive premium article.

Mountainsmith’s popular MountainLight series is gone and is being replaced with a new TrekLight series that so far consists of the AT 55 and PCT 45/CDT 45. The new packs depart from the familiar beige Dimension Polyant fabric, and are frankly “softer” and more user-friendly. The AT 55 essentially replaces the popular Auspex, but the new pack is so different that they can hardly be compared. A closer comparison is with the new 2006 Osprey Aether 60 which we recently reviewed. How does the new TrekLight AT 55 stack up as Mountainsmith’s new frontrunner lightweight pack, and how does it compare with Osprey’s Aether 60? Read on.


  • Introduction
  • What's Good
  • What's Not So Good
  • Specifications: Maufacturer, Year/Model, Style, Volume, Weight, Fabrics, Frame, Features, Volume to Weight Ratio, Comfortable Load Carrying Capacity, Carry Load to Pack Weight Ratio, MSRP
  • Performance
  • What's Unique
  • Recommendations for Improvement

# WORDS: 1900

# PHOTOS: 16


--- End of free preview ---
Member Exclusive

A Premium or Unlimited Membership* is required to view the rest of this article.


* A Basic Membership is required to view Member Q&A events