This envelope is designed to hold xray
film or negatives securely and safely for storage. Although it has
no flap, it is still considered an envelope. The flush cut along
with a double thumb cut allows easy access to its contents. It is
made of 40# brown kraft, paper that is smooth yet has more fiber to
provide greater strength and durability. It is available as flat or
as expandable envelope.
X-Ray Negative Expansion