The ergonomic fit and ventilating features of the Deuter AC Aera 24 Backpack make long hikes to hidden peaks all the more enjoyable. The backpack features anatomically shaped, padded shoulder straps and a lightly padded hip belt, both with mesh covered foam for enhanced breathability the adjustable sternum strap helps take a load off your shoulders. The backpack fits torso lengths ranging from 17 to 19. 5 inches, carries up to 18 pounds of gear, and provides ample room to hold supplies for a long day hike. Once you're moving on the trail, the supportive spring steel frame and side compression straps support and balance your load, while the ventilating AirComfort mesh back panel provides breathable comfort. If the weather's drizzly when you hit the trail, the backpack's water resistant fabric will protect contents inside, and an integrated rain cover offers added protection if the drizzling doesn't let up or turns into a downpour. The backpack is compatible with your hydration reservoir, and includes a reflective attachment for your drinking tube so you can easily find it if you're out on the trail before sunrise or after sundown. Stick items you'd like quick access to in the mesh side pockets and store valuables in the protected zippered lid pocket. Attach tools or carabiners to loops on the lid, and slide your hiking poles through the side pole attachment loop. When you reach a scenic peak that makes a good lunch spot, open up the front panel for easy access to your food and supplies.