solid paper bag containing Silica gel desiccant is a physical adsorption desiccant rather than a chemical reaction moisture absorption desiccant, and silica gel is FDA approved for direct contact with food and drug desiccant raw materials. Compared with other desiccant, silica gel desiccant used in food moisture-proof is better. In addition to the above factors, silica gel desiccant also has strong hygroscopic ability, adsorption performance is strong, silica gel desiccant all bubble into the water, it will not melt. With, tasteless, no corrosion, no pollution characteristics, even if ingested will not be absorbed by the human body.