Odo's bucket

Odo's bucket or pail was an object that Odo used when he had to revert to his gelatinous state. 

Nog and Jake Sisko once stole Odo's bucket to impress Varis Sul. Nog put oatmeal in the bucket and dropped it in front of Jake, who thought the oatmeal was Odo. 

Benjamin Sisko once asked if Jake had ever put a hole in Odo's pail. 

Odo brought his bucket with him when in the Gamma Quadrant. 

Odo gave his bucket to Kira Nerys just before he left Deep Space 9 at the end of the Dominion War.