Black Diamond Anarchist Avalung S/M Pack - With its versatile, top-loading design and 40L carrying capacity, the Black Diamond Anarchist Avalung Pack is the go-to choice for ski guiding, snow work and multi-day backcountry trips. In the event of a slide, the built-in AvaLung increases chances of survival by extending your fresh air supply and the dedicated avy-tool pocket keeps your shovel and probe at the ready. The zippered backpanel lets you access your gear without removing your pack or while carrying your skis.