Aeroflex & Aeroflex Easy Adjust - MAXIMAL BACK VENTILATION in the Aeroflux system, a lightweight, high quality spring steel frame makes a taut mesh tension for optimal 3-way ventilation (blue arrow) in the Aeroflex Easy Adjust system, the mesh tensioner can be easily released - a great advantage on uneven terrain or on demanding bike descents when your pack should ride flat against your back. It doesn't get any easier than this: the Ultralight combines optimal ventilation of the back with an ultralight backpack for comfortable carrying of light loads. The space between the backpack and your back can be easily adjusted for different activities. Taut mesh tension: great ventilation, ie. for strenuous ascents. Relaxed mesh tension : secure body hugging fit, ie. for via ferrata. The continuous adjustment of the straps enables an individualised fit for torso length   Back to Vaude Product Page