Features:<p><li>24 oz.</li><li>Tight-sealing Big Mouth screw top is big enough for ice cubes and powder drink mix</li><li>Easy to flex and easy to drink bottle, yet very durable. Very easy to squeeze! </li><li>Watergate cap features self sealing valve, easy to clean and leak proof!</li><li>Each Purist bottle is infused with silicon dioxide, which forms a protective glass-like barrier inside the bottle. This prevents odors, stains, and mold from attaching to the inner surface. Note: This is not silicone, rather silcon which is an indispensable part of the food we eat.</li><li>One drink and you will realize what the difference is like. Water remains clean and pure.</li><li>Uses BPA-free plastic</li><li>Visit this <a href="http://specializedwaterbottles.com/purist/">website</a> for comprehensive information about Purist water bottles.</li></p>