Capacity: Most models are available in 1000ml (1 liter) or 500ml (approx. 17oz) sizes.
Design: Features a square body that fits easily into refrigerator doors or backpacks and a wide-mouth screw cap for easy pouring and cleaning.
Material: Usually constructed from BPA-free, leak-proof plastic (like PS or acrylic).
Portability: The lightweight and leak-proof design makes it suitable for travel, school, office, or outdoor activities like camping.