The karrimor airspace 358 rucksack is the perfect sized rucksack to be able to take all your gear with you for a glorious weekend of backpacking the airspace 358 features the airspace back system which makes the pack stand rigidly away from your back and minimises contact in order to let air flow both horizontally and vertically to keep your back cooler and more comfortable even though this backpack is called a 35 we think it offers so much more space in comparison to the average 35 litre days