MIL-D-3464E Type I & II Humidity Control. Desiccants that are packaged in porous materials such as Kraft Paper or Tyvek. Desiccant bags absorb moisture, odors and chemicals to preserve and protect your products such as semiconductors, electronics, cartons of food, and all types of machinery. Products in nearly every industry require protection from moisture. Effective ways to control moisture exposure and prevent rust, mold, and mildew.