I found these 4-packs of Starbucks Frappuccino that are the perfect shape and size(9.5 oz), and pretty affordable at around $5 per 4-pack at Target. The labels peel off easily and I spray painted the lid silver to give it that vintage look. I also ran the bottle through the dishwasher and still had to use the rough-side of a sponge to remove some sticky residue where the label had been. It does come off easily, though. Fill with milk and enjoy your individual milk bottles for kids birthday p...