Such asmilitary rucksackin the snow, only thewhiteandthe backgroundcan becoordinated;at sea, military rucksackwithonly thebluetoblend;in thedesert, onlybrownand backgroundcloser.In many cases,naturalbackground is notgreen, military rucksackwhich requiresthe background ofthe prevailinglocalconditions,flexible andreasonable choice ofmilitary rucksackcolor.