NALGENE* Labtop Cooler. Polycarbonate. Capacity: 12 tubes. 15.1Lx10.8Wx12.5Hcm. Maintains temperature below -15 to -20[degree]C for up to one hour at room temperature use. Holds 1.5 and 2.0mL microtubes. Holds 0.5mL tubes by inserting adapters. Usable to -135[degree]C. Break resistant. Stackable.