Bag Weight: 3 lbs (Generous volume with ideal moisture retention) Generation: G2 (Grain-to-Grain master transfer for maximum vigor) Substrate Base: Premium Sorghum Base providing thousands of tiny inoculation points per bag for fast substrate leap-off. • Storage: Best if used immediately upon arrival. If you need to wait, store the bag in a cool, dark place or refrigerate (35 to 40 degrees F) for up to 4 weeks. Do not freeze. Note: This is a live biological product. For best results, inoculate your sterile bulk substrate in a clean environment as soon as your spawn arrives.