Thickened dual-layer HDPE formed in one piece with a PTFE corrosion-resistant sealing gasket for long-lasting protection against moisture and leakage. Produced under a fully dust-free process with strict particle and metal ion leaching control. The moderate capacity balances handheld sampling with medium-to-long-term sample storage. The threaded cap seals tightly and supports repeated dispensing, with custom colours available on request — suited to laboratory testing and production line transfer of various clean liquids.