Hydroflask 20 liter hydration backpack. Comes with 3 liter insulated water reservoir and bite valve. keeps water cold for more than 4 hours. Watertight construction made with waterproof fabric, taped seams and sealed zippers. Pack has two main compartments and two smaller stash pockets. There is an insulated reservoir sleeve in the largest of the two compartments. Adjustable shoulder straps, hip belt and chest strap. Color is cobalt blue, back airflow and strap system is a brighter complementary blue. Torso size is M/L. Torso length 18.5 inches from top of pack to bottom. BPA and PVC free.