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  I use glass, it works the best.  My grandma tried some plastic containers and the only one that worked was frosting tubs.  I use 1 to 1&1/2  glass cups with plastic lids.  Comes out perfect everytime.  Just make sure everything is super FRESH!!  Also, the yogurt will stay fresh longer in the glass.  
				__________________-Vivian  Mommy to my cuddlebug baby boys-Snickers & Reesie   |