Transport tubes offer advanced seal and extended deep cap to prevent leaking when shipping samplesCompliant with 95 KPa IATA Packaging Instruction 650Cap is designed to accommodate swab for transport, and is easily sealed or removed with a single turnSelf-standing base allows use without racksRound bottom maximizes liquid retrieval and will not pinch swabsHigh-quality, medical grade virgin polypropylene is transparent for viewing samples, shatterproof, and resistant to heat and coldConvenient zip-closure bag is a practical alternative to folding and taping opened bags