How do I choose the right grade of polyethylene for packaging applications?

I visited a packaging materials store to ask about polyethylene two days ago. I wanted to understand which grade works best for packaging applications because there were too many options available. I also wanted something strong and reliable that can protect products properly during storage and shipping. But when I checked the materials there I felt confused. Some polyethylene grades looked flexible and lightweight but sellers said they are not good for heavy packaging. Some looked stronger and thicker but the prices were much higher. Some suppliers kept mentioning technical names like LDPE and HDPE but explained them in very complicated ways. I could not trust my understanding. I could not decide confidently.

Then I visited another supplier in the same area. Some companies explained the differences more clearly and showed samples for different packaging uses. Some grades looked better for food packaging while others were made for industrial products and shipping bags. Some still gave mixed advice about durability and long-term performance. I remembered one time when I bought packaging material because it looked strong enough but later some products were damaged during transport because the material was too thin. That experience still stays in my mind. That made me worry again.

To check more variety and options while scrolling many online platforms including alibaba I found many polyethylene grades for packaging applications. Some suppliers focused on flexible films and lightweight packaging. Some offered heavy-duty polyethylene for industrial storage and shipping. Industry forums and packaging discussions also shared real experiences from manufacturers and business owners. Some materials looked affordable but had mixed reviews about durability. Some looked expensive but more trusted for professional packaging use. This made me excited but also confused again.

Now I am thinking should I choose cheaper polyethylene grades for lower costs or spend more money on stronger materials for safer and more reliable packaging results?