we don’t ship package to APO/FPO,No international shipping! Small quantities orders will be shipped by USPS first class mail, others will be shipped by USPS priority mail(expedited mail)! * Gray outer surface, black inner layer. * Good quality self sealing mailers. * water proof. * tear resistant. * lightweight.* No other smell. * 4lbs /100pcs, you just weight the same size and quantities you bought from other sellers, you will know our items what you need.