Natural PPCO Micro Packaging Vials: Sterile, Bulk Pack. Thermo Scientific Nalgene. Leakproof when used with Nalgene closures 0.5, 2.0 and 4.5mL 0.5, 2.0 and 4.5mL Vials: Skirted, with conical interior 1.5mL Vial: Conical design Ordering Information: Micro Packaging Vials are bulk packed without closures, 500 per inner bag, 1000 per case