Standard freezer box to hold 100 microtubes, with lid. Added an empty box, with 81 tube insert grid. These boxes are very overpriced from scientific suppliers. Lid is best printed in clear PLA upside down, no bed adhesion. Grid is best printed in PLA without any brim or bed adhesion. Cost per box is about $3. Suitable for as low as -20C, but not cryogenic storage.