Our 1 x 1 (up to 1-liter or less inner-packagings) United Nation approved 4GV kits for allow you to use a wide variety of inner-packagings. This Variation 2 shipper is suitable for air shipments with appropriate inner-packagings. 4GV kits come with UN approved fiberboard box, corrugated inserts for 1-liter or less inner-packagings, absorbent-lined bags and closure instructions. Great alternative to vermiculite shippers Ideal for no dust clean room environments