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Material: Glass vs plastic (polypropylene, polystyrene etc.). For lab/chemical use, PP or glass is used.
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Capacity / size: e.g., 3 ml, 5 ml, 30 ml etc.
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Cap / closure type: screw cap, fliptop, tamperevident etc.
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Transparency / colour: Clear / amber / transparent depending on light sensitivity.
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Use / application: Some are general multipurpose (storage, transport) while others are specialized (serum transport, cryo vials) etc.
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Quality / manufacturing specs: For lab use maybe sterile, leakproof, compatible with equipment.
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Type: Self-sealing thermoplastic film