2. Micro perforated bags are made by European imported hot needle peforator with popular hole densities, 25 holes per cm2, 6 holes per cm2, etc. Macro perforated bags with punch hole diamters such as 6mm, 8mm, etc. Our perforated produce bags allow your vegetables to breathe without trapping harmful fumes. 3. Micro and macro perforations vent smells to attract customers with the fresh scent of food. 4. Excess moisture is allowed to escape to keep food fresh longer.