These Sport Bottles by Squeasy Gear are AMAZING!! They can go in the dishwasher or the freezer. Fill it with your favorite drink and pop it in the freezer and you can have a delicious slushy. The bottle is flexible, bacteria resistant silicone so you can squish up your ice and have a wonderful snack on a hot day Special filter eliminates spills and leaks so there is no mess. All the pieces come apart for easy cleaning. It is great for those who make their own smoothies!