The Ultra Train 18 pack is a lightweight, durable pack made out of 70-denier ripstop nylon, and weighs in at 339 grams. The Ultra Train 18 comes with a Dry Back System with 3D channel ventilation allowing a great fit and breathability. Twin Compression System ensures a secure load, and the ability to adjust compression on the fly. Comes with a secure zip pocket for valuables, a pocket for trekking poles, and reflective logos to keep you seen at night or in inclement weather. Designed for fast moving mountain activities and speed hiking.