Freshness-keeping carton: Preservative coated inside the cartons to maintain the freshness, it's mainly applicable to the packaging of mango, banana, cucumber, etc. Damp-proof carton: Special treatment to the inside, medium and outside liner, it's applicable to the packaging of fresh meet and frozen products. Water-proof carton: Inside liner by being film & light oil coating and aluminizing, it's applicable to the packaging of water involved products or aquatic products.