Salomon Trail 20 Running Backpack - AW15 3D Airmesh Shoulder Straps - Strategically applied fabrics increase ventilation and reduce friction on shoulders or around the neck. Adjustable Belt and Sternum Strap - Deliver a secure and adaptive fit that distributes weight evenly. Bladder Compartment and Hanging System - Facilitates efficient, consistent fluid delivery. Compression Straps - Compresses the backpack's contents to improve stability and capacity. Airvent Agility - Moisture wicking fabrics and strategically positioned air vents draw sweat away from the wearer's body whilst allowing air to fully permeate the pack, promoting a cooler, drier and altogether more pleasant environment.