1. Touch, the material is softer is PA material, the ha […]
1. Touch, the material is softer is PA material, the harder is PET material.
2. Listen, knead with your hands. The dull sound is PA material, and the sharper and harsher sound is PET material.
3. Put the two kinds of vacuum compressed bag in the refrigerator compartment for a while, and the harder ones are PET.