3D Vent Mesh: Ridged EVA foam with molded air channels accompanied by an overlay of lightweight recycled triangle wall mesh will keep your back cool by enabling optimal airflow.Dual Adjust Sternum Strap: Easily adjustable straps give you a custom, comfortable, and secure fit for the journey ahead.Fuel and Gear Storage: Ample space and compartments for easy access to all of your hydration, gear, and essentials.Stretch Overflow Pocket: Secure outer pocket for any last minute extras, like a rain jacket, shoes, and more.Trekking Pole Attachment: Easily attach and remove poles when needed