2011 lastest top fashion backpack bag 1.OEM sample for free 2.Factory direct ... permeability and good wear resistance.2.Strap using the memory grid, ventilation and strong. Medium width, bear the weight ... the yellow zipper in the bags will not fade.Main bag black zipper rounded, smooth.By UK BS-3084, ... long time using.7.Testing: Every parts of the bag can affort about 45N=45kg, and can affort suddenly ...