The Crypt is made of tough surgical grade stainless steel. 100% BPA-free elastic ABS compound seal to lock in flavor & freshness. Rugged impact resistance mounted lid. Stainless steel bail clasp for fast and easy lid sealing. Built in hygrometer & temperature thermostat to maintain storage climate. Includes an internal relative humidity pack carousel, a free RH STAYFRESH humidity control pack, and a soft satin pouch for added protection.