Brass ID Containers

I like these so much it's unquantifiable.

From the website:
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Brass ID Containers

Originally designed to hold identification information for pets, these tiny cases (1" long by 1/4" to 3/8" dia.) are equally useful for attaching to backpacks, equipment bags, or anything that might get lost or left behind.

Turned from solid brass, each has a plated steel split ring for attachment to a ring, buckle, cord, etc.

They are attractive, durable and useful, whether for pets or people.

Six of these little cases total less than 1 oz in weight.
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Six for $2.75.