THIS HYDRATION PACK IS A VERSATILE ADVENTURE LIFESTYLE GEAR FOR ADVENTURERS EVERYWHERE. IT IS IDEAL FOR KEEPING YOU HYDRATED DURING ROAD BIKING, TRAIL RUNNING AND HIKING. LIGHTWEIGHT, CUSHIONED, BREATHABLE MESH BACK PANEL, MADE OF HIGH-QUALITY NYLON FABRIC, ATTRACTIVE AND DURABLE. 17 9/10" L X 8 9/10" W X 2" H