The Lowe Alpine AirZone Trek 35:45 Backpack focuses on carrying comfort and ease of use. The combination of the ventilated Airzone +™ Carry System with Formknit™ Technology and internally adjustable back-length provide unrivalled levels cushioned comfort. Practical pocket space and storage arrangements provide a platform for a fully organised, adventure ready rucksack. This backpack can be extended from 35 litres to 45 for the extra gear you might need to carry so ideal for when you struggle to repack your gear once you\'re already out and about.  Lowe Alpine Airzone Trek 35:45 Backpack Features: Airzone +™ Carry System 210D 6.6 Mini Ripstop / HydroShield Fabric Zipped Front Entry with Divider Panel Stretch Mesh Front Pocket Front Lash Points Featuring Formknit™ Technology Internally Adjustable Back-Length Breathable Harness and Hipbelt Headlocker Axe Attachment System Secure Tipgripper Walking Pole Attachments Large Stretch Mesh Side Pockets External Zipped Lid Pocket Forward Pull Hipbelt Adjustment with Zipped Hipbelt Pockets Internal Zipped Security Pocket with Key Clip Rain Cover Weight Approx 1.65kg