Don't "mess" with lightweight, flimsy trash bags. Premium linear low density - Provides excellent puncture and tear resistance. Handles heavy items and sharp corners without tearing. Strongest trash bags on the market - Made with premium resins. Star Seal Bottom. Uline Extra Heavy Trash Bags are over 45% thicker than Sure Sak liners. EXTRA HEAVY STRENGTH: For your heaviest warehouse trash. BLACK: Hides bag contents.