The four cups feature twist-to-close lids for spill-proof storing and traveling, in the freezer or in the diaper bag. Stack all four cups together or use one at a time. Snack-A-Pillar cups are easy for little hands to hold – and simple for big hands to load and stack. Optimal for babies 6m+. Dishwasher safe (top rack) for quick clean up. Store and serve snacks and liquids for baby at home or on the go with the brightly colored stackable Snack-A-Pillar Snack & Dipping Cups. BPA free.   The four cups feature twist-to-close lids for spill-proof storing and traveling, in the freezer or in the diaper bag. Stack all four cups together or use one at a time. Snack-A-Pillar cups are easy for little hands to hold – and simple for big hands to load and stack. Optimal for babies 6m+. Dishwasher safe (top rack) for quick clean up. Store and serve snacks and liquids for baby at home or on the go with the brightly colored stackable Snack-A-Pillar Snack & Dipping Cups. BPA free.