The lightweight 30L Transistor backpack is a must-have for every outdoor adventure. Created with versatility and performance in mind, this lightweight pack has the features of a larger hiking pack in an easy-to-carry size. The Transistor is packed with useful features. It’s fully hydration compatible. It has dual ice axe and trekking pole attachments, a security pocket with key clip for safety and more multi-pocket storage solutions. We added 3D air-mesh ventilation on the back panel for your comfort on the trail.