We Offer Sample Container. Sample Containers are Made of Polypropylene. These Thin Walled, Disposable Containers are Easily Screw Capped with Less Than 14" of a Rotation. as One Screw Caps the Container, the Top of It Sets in a Domed Ring in the Cap Making It Completely Leak Proof. this is Perhaps the Ideal Most Option Available for Carrying Samples from One Place to Another Safe & Sound