This shoulderless polypropylene 20 ml vial features a full width opening of 23 mm for ease of access, a high degree of resistance to organic solvents, and sufficient translucence so that reagent levels or the presence of filter paper can be easily detected. The unique thread design of the closure permits the vial to be sealed and opened with an easy 1/4 turn. The quality of the sealing system is such that it is not necessary to tighten the closure with a lot of pressure to achieve a leakproof seal. The linerless polypropylene caps are packed in a plastic bag. Polyethylene closure may not be autoclaved. Dimensions 26 x 61 mm.