What is the difference between aluminum foil bags and plastic bags?

Aluminum foil bag generally consists of four layers of different ingredients, has the good oxygen insulation, waterproof function, and can be moisture, avoid light, can also be items in vacuum, it fresh, fragrant effect is very good, such as aluminum foil bag packaging such as drugs and milk, because the plastic bags is a single layer, and every tide, oxygen insulation function is bad, will not be able to do packing demanding items. 【 Aluminum foil bags 】