Pack Alp Trainer 20 W Introducing the Alp Trainer 20, our technical alpine hiking pack for shorter hiking tours. It features our new Dry Back Air carrying system that is designed specifically to keep your back dry. With 26% less surface area contact than our previous constructions, it reduces body contact without impairing load control. The built-in ventilation system with breathable materials lets greater airflow get to your back. After 15 minutes of activity, the new Dry Back Air system reduces temperature at the back by 1.5°C compared with our previous Air Fit system. Our lightweight split shoulder straps also reduce body contact, promoting greater perspiration and comfort, enhanced airflow and increased mobility. In addition, the Twin Compression System (TCS) allows you to cinch the pack in to keep the load close to your back, to support sure-footed movement. And it also lets you adjust the volume quickly and easily when you’ve removed your rain jacket etc. We’ve given the Alp Trainer backpack all