2kg (upped from 1.5kg) of sterile and sealed grain, at the corrent moisture content for innocualtion.
This grain has not yet been innoculated with mycelium and can be innoculated at the users choice.
It will have been sealed along the top. You will need to cut the bags open, innoculate, and re-seal. You can also cut a very small hole in the corner to inject spores or liquid culture, and seal the hole up.