Holds up to 23 oz.of liquidand is collapsible for easy transport. Three parts makes it easy to clean and refill. Internal measuring lines. Standard size cap allows it to function with optional mouthpieces and filters. Loop for comfortable carrying or strapping to a backpack. Made from BPA- Free polypropylene and soft anti-slip TPE. When you've finished your beverage collapsethebottominto the topto savespace. Dishwasher and microwavable safe.Sold in assorted colors: Red, Orange, Blue, Green, Pink, & Black.