Make multi-day hiking trips and tough hut-to-hut treks a breeze with the cool, ventilated carry of the AirZone Trek 45:55 hiking backpack. The AirZone Trek 45:55 provides a supportive and comfortable carry, however intense the hike. It features our award-winning, fully adjustable AirZone+ ventilated carry system, with patented FormKnit technology for all-day comfort. Built from tough, wear-resistant fabric, the AirZone Trek 45:55 features zipped front entry for easy access to the main compartment. Our AirZone Trek 45:55 hiking backpack is full of trail-friendly features including stretch mesh side pockets for your water bottle; a front mesh stash for your jacket or map; upper and lower compression straps; and walking pole and axe attachments. A large-capacity top pocket provides easy access to essentials, and a flexible lower compartment separates your sleeping kit from your day gear. Along with an integrated rain cover and water bladder compartment, the AirZone Trek 45:55 hiking backpack also features an extendable lid for an additional 10 litres of packing flexibility.