It can get hot during the day on a summer or fall hike. To avoid massive back sweat while youre clambering up the trail, Lowe Alpine made the AirZone Centro 27 Pack with a ridiculously airy back panel. While this back panel has minimal contact with your back, it still provides plenty of support for the snacks, wind jacket, and water you have in this pack. A front stash pocket on the AirZone Centro 27 keeps sunscreen and trail maps at the ready, while a large side mesh pocket holds your water bottle. Adjust the torso length for a comfortable fit.