brand Sample Containers are made of Polypropylene.
These thin walled, graduated, disposable containers
are easily screw capped with lass than 1/4"
of a rotation. As one screw caps the container,
the top of it sets in a domed ring in the cap
making it completely leakproof. This is perhaps
the ideal most option available for carring
samples from one place to another safe and sound.