Get 30 bags with 3 lbs of sterilized hydrated grain, injection ports and 0.2 micron filters for a total of 90 lbs. Bags are 4 x 5 x 18 inches, 3 mil plastic making them durable and easy to shake, mix or add agar wedges to if you have a good impulse sealer. Otherwise it's best to use a spore syringe or liquid culture syringe.