I'd be a bit careful about what materials you place the beans into - especially plastics. Beans can sweat via rapid temp up & down conditions, etc. Grainpro undertook literally 1000's of hours of R&D and then years of controlled testing to develop their product. If you are going to use a material, something with foil laminates like those found in coffee bags may be best. You can also buy the coffee bags without valves - so that might be an option. We have a bean that we use over 2 ton a month that arrives in a Poly bag that is not grainpro and quite recently we undertook some additional research at the potential affects of the liner on the bean. Accurate moisture and density meters are something that can record the technical characteristics of the bean over time. I have 200+ kg of a bean that is 3 year old in our greens area and I roast it every 3 or 4 weeks - it's still superb and unmatched. My take on it.......don't go overboard folks.......greens will emit aromas and vac sealing helps concentrate these aromas.
