This kit will perfectly fit your Sterlite Storage Box and Monotubs for the sizes in the heading. You get two 4 lb bags of CVG++ Horse Manure Substrate for Grass Lover’s: this is our best substrate and works great for all dung loving and medicinal mushrooms, especially grass loving species. Our CVG++ Concentrated Horse Manure substrate is hydrated to a little over field capacity and is made with shredded coco coir, extra concentrated powdered horse manure, vermiculite, gypsum, and our proprietary blend of micronutrients. We highly recommend using Dr. Myc’s MGP+ in the recommended amounts to increase yields and greatly cut down on the risk of Trichoderma and other contaminants. We can tell you that based on personal experience, it makes a difference! This kit will include 4 lbs of sterilized rye grain or a mixture of rye and millet and an injection port in case you are using spores or liquid culture. You will also get more than enough 50/50 sterilized Peat and Vermiculite casing layer carefully PH balanced with calcium hydroxide to give you extra time before outside contaminants could set in. Just remember to spray it with distilled water to get the right consistency for the species of mushroom you are growing. Unlike most vendors, we seal our bags BEFORE putting in our commercial sterilizer.  This practice if done right drastically cuts down on contamination risk to ensure you get a superior product”.