Mushroom growing bag size is 39*80 cm. EASIEST WAY TO GROW MUSHROOMS: This all-in-one mushroom growing kit contains everything you need, grains and substrate blend ready, just add spores or liquid culture! Comes with an instructional guide and video link. MUSHROOMS GROW DIRECTLY IN THE BAG: Ditch the monotubes and other expensive supplies. Grow mushrooms directly in the bag for up to three harvests. Mushroom spawning bag, substrate, and substrate chamber all in one bag! HIGH YIELD MIX FOR MANURE-LOVING MUSHROOMS: Developed by mushroom scientists, this mix is a blend of sterilized millet, high quality manure, vermiculite, coir, and gypsum. Millet is better than other grains such as rye berries because its size maximizes the surface area for mycelial growth. LABORATORY QUALITY MUSHROOM CULTURE BAGS WITH INFUSION PORT: Includes a 0.02 micron filter for air exchange. RISK-FREE: With our hospital-grade sterility testing and batch tracking system, we guarantee our products to be sterile or your money back!