Each Hush Kush carry case has Perma-B technology, a coating made of natural ingredients that is unparallelled in the cannabis industry. These discrete storage and rolling solutions are smellproof, waterproof, biodegradeable, washable and resuable! Each Hush Kush carry case has Perma-B technology, a coating made of natural ingredients that is unparallelled in the cannabis industry. These discrete storage and rolling solutions are smellproof, waterproof, biodegradeable, washable and resuable!