High density freezer bags are made from High Molecular, High Density (HMHD) polyethylene. This extremely durable and flexible material allows our food storage bags to be frozen to -50° F and then heated up to 220°F. Food can be taken directly from the freezer to microwave or boiling water, steamers, or warmers without freezer burn and without the need to repackage or transfer foods. Prevents and resists grease and leaks, they also prevent foods from drying out with moisture vapor barrier, prolonging shelf life in freezers, coolers and warmers. Dispenser Pack. Clear w/twist ties.