1. Color
Most people think that white lunch boxes are clean and hygienic. This is wrong. White or yellow lunch boxes are not healthy lunch boxes. Real environmentally friendly PP lunch boxes are transparent or translucent. The original nature of the raw materials; some qualified lunch boxes may also add edible raw materials (approved by the health department) or additives during the post-production process in order to enhance their appearance and toughness.
2. Smell
Some low-quality lunch boxes themselves will have a pungent smell. This is due to the wrong raw materials used or the addition of some harmful chemical reagents or industrial additives during the processing. Please use them with caution.
3.Texture
Qualified PP raw material lunch boxes themselves will have a certain degree of "toughness" and will not be brittle or break when poked. They should have high toughness and strength and can be stacked together.
