Get Our New TMU Grow Bags. Made Out Of Cast 4Mil Polypropylene And A Hydrophobic .22um Filter Patch. You Will Find These Bags Are Superior To Any Grow Bags On The Market Today. They Can Withstand 20 PSI At 285°F. The Bag Itself Measures 4 Inches Wide, 4 Inches Deep And 18 Inches Tall