Reviewed by Darren, Shrewsbury - 11th Nov, 2020 Good, comfortable, well featured day sack, for hill-walking! The AirZone Trail 25 is a well-featured, 25 litre day-sack, for hill-walking. The AirZone back is highly breathable, supportive and comfortable, especially good for summer heat. It is hydration bladder compatible, as well as having two expandable mesh side pocket,s that each take 0.75 litre bottles. There are outer and inner lid pockets, with a key fob, hip-belt goody pouches, a main, single buckled compartment, rucksack cover at the base and excellent, tip-gripper pole holders to secure trekking poles. Well-thought out features, ideal for good days hill-walking, in the British Countryside.