Montbell Square Bottle 0.5L, 1.0L, 1.5LEngineered for maximum pack efficiency. This square profile vessel is constructed from a high durability, BPA free material that is naturally odor resistant, ensuring your hydration remains untainted. Its flat, anti roll design allows for streamlined storage in tight compartments or side pockets where traditional bottles fail. The precision narrow mouth aperture is designed for controlled intake, preventing spills and surges during high output