A portable and reusable container meant to hold and transport water or other liquids while on the go is known as a travel water bottle. It is often made of a sturdy and lightweight material such as plastic, stainless steel, or silicone, and may have characteristics that make it useful for travel and outdoor activities. Travel water bottles range in size, shape, and design, from tiny and foldable to huge and insulated. Certain portable water bottles are also leak-proof or spill-proof, making them suitable for use in backpacks, handbags, or other types of travel bags. Many travel water bottles also have extra features like a built-in filter for purifying water, a straw or spout for convenient sipping, or a carabiner.