Aluminum Bag is made of foil laminated film with 5 layered (from outer: nylon, polyethylene, alum foil and polyethylene, polyethylene). Having good permeation resistance to permanent inorganic gases, methane and strong mechanical strength. It is suitable for sample needed shielding. Aluminum Bag is relatively high absorptivity to high boiling point organic compounds, and there are few elution of organic compounds from this bags. There are various line-up large size from 20 L to 200 L as a total : from 1 L to 200 L.