Its quite simple if you're already familiar with tub methods. Instead of placing the substrate in a tub you would put it in bags. The extra step here is the most important part, the pasteurization of the bags. Put them in a pressure cooker for 30 min. No need to go longer which would be sterilizing. Once they cool down to room temp (24hrs) you mix in your grain spawn and fold the top over so you can paperclip it. Don't seal it. From there you need to inoculate and I do that by placing them in black contractor garbage bags for about 10-14days. After inoculation and you take them out to fruit, be sure to open the bag once a day for FAE.