The i-Run team says
Technologies
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                            Sensifit SacThis innovative construction employs self-adjusting materials and conforms to your body for a perfect fit and stability. Your equipment stays in place without hindering your breathing. 
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                            3D Air MeshExceptionally flexible, the 3D mesh perfectly conforms to the shape of the body even in motion, without causing any skin or t-shirt abrasion. The wide mesh is highly breathable and comfortable. Ideal for lightweight and fitted trail backpacks. 
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                            Quick LinkThis innovative chest strap construction allows you to adjust and tighten the bag quickly, even without stopping. The elastic strap also makes breathing easier during intense activities. 
 
                                 
                                 
                                     
                                     
                                     
                                     
                                     
                                    