THE RETURN OF A CLASSIC ALTURA BACKPACK, REDESIGNED AND MODERNIZED AS A HIGH-QUALITY MULTI-PURPOSE BACKPACKDESCRIPTION Launched in 1997, the Altura Chinook cycling backpack returns 25 years later as a redesigned and reimagined adventure backpack, updated with modern fabrics and technologies. 100% recycled polyester with a waterproof finish to keep the rain out and your gear dry. It features a secure helmet holder and separate hydration bag compartment for those days when you need to stay hydrated, plus plenty of storage, including bottle holders for those long days out on the bike. Side compression straps ensure a comfortable fit, while adjustable/removable waist and chest straps let you adapt this bag to your own adventure.TECHNOLOGY- 100% recycled polyester- Water-resistant finish (DWR)- Secure helmet holder- Separate hydration bag compartment- Zippered lid pocket with key ring- Side bottle pockets/storage pockets- Adjustable and removable chest strap- Adjustable and removable ventral strap and side compression straps- Lamp loop