3.0 CUFT, Sunshine Mix #4, With Mycorrhizae, High Drainage, Formulated With Canadian Sphagnum Peat Moss For Increased Moisture Retention, Optimum Air Exchange & High Caution Exchange Capacity, Plus Coarse Perlite For Amplified Root Zone Aeration, For A Professional Light Weight Growing Medium, Multiple Strain Mycorrhizal Blend, So You Achieve Maximum Results, After The First 2 Irrigations You Will Be In Total Control Of Your Fertility Program, Lime, Gypsum & Proprietary Wetting Agent Combine To Professional Quality Mix Which Meets The Needs Of Serious Minded Growers.Now Contains Resilience- Sun Gro's Brand Name For Patented Growing Mixes Enriched With Silicon For Stronger Stems & Improved Root Mass. This is a compressed soil medium that expands to 6 cuft.