The updated DartTLS (Technical Lumbar System) is an ultra-lightweight and slim profile sport pack that is ideal for trail runs, fast hikes, or that cross-country glade. With reflective piping, side energy gel pocket, perforated airflow foam padding and one BPA-free water bottle included, you'll be darting around in no time. Newly featured Lumbar Control Point pad locks the pack into your lumbar region for added stability. Made from 450d Reforge, Mountainsmith's 100% recycled PET - Same performance, comfort and durability you've come to trust, but reducing our impact on the planet one bag at a time.