[0116] The apertures 6 of the second resilient layer 4 are aligned above each respective through-hole 23 of the lid housing 8. The apertures 6, like the apertures 15, are self-healing such that they are configured to open when the pipette tip 71 is pushed through, and after the pipetting procedure, the apertures 6 close on their own to seal the headspace 20.[0117] FIGS. 15 is a cross-sectional view showing a sealing mechanism 9 in an opened condition. FIG. 16 is a cross-sectional view showing the sealing mechanism 9 in a closed condition. The sealing mechanism 9 is configured to press the lid housing 8 onto the sample container 18 with a sufficient amount of pressure to create an air-tight seal between the lid housing 8 and the sample container 18, without damaging to the sample container 18.