The Patagonia Nine Trails 20L Backpack provides out-of-the-way comfort while carrying all the essentials. Equipped with a U-shaped lid, its easy to access the main compartment, while exterior stretch pockets make room for extra items you're wanting to bring along. Its Mono-Mesh back panel allows easy airflow, preventing sweat buildup and keeping you cool while you spend the day scrambling up hillsides.