"The Patagonia Terravia 22L Pack is sized for the long ridge traverse and the summit approach with a weather window to watch. The recycled nylon ripstop body and included rain cover mean a passing storm doesn't end the day early, and the padded mesh back panel keeps airflow moving on the climb. What Our Gearhead® Experts Are Saying:""I grab this for full-day trail objectives where I want everything I need and nothing I don't. The 22 liters swallows a shell, lunch, and a two-liter reservoir, and trekking pole carry rounds out a build that handles the full toolkit."""