1. Thickened kraft paper--use food grade paper, which is safer to use
2. Stiff and not easy to collapse -- strong bearing capacity, thickened paper to enhance compression resistance, not easy to break
3. The inner wall is coated to prevent leakage
4. A variety of specifications, a variety of optional cover
5. Thickened double-layer heat insulation, anti-scalding and anti-leakage