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It is called a Caddy. A Malaysian word
Tea leaves.
Loose tea is stored in a tea-caddy.
To me, being English, a caddie box is a tea-caddy. A tea-caddy is a box, jar, canister, or other receptacle, in which loose leaf tea is kept. There are tea-bags in mine!
What is to sty as horse is to stable
It's called a caddy, a tea ball, or an infuser.