Boasting a heavier, more powerful 12-Gauge Blender Ball, a rounded base and a massive 45-ounce capacity, the Blender Bottle Pro45 is built to go big. The Pro45's massive 45-ounce capacity fits virtually all mass gainer shakes, multiple scoops of a recovery drink, or enough water to keep you hydrated with minimal refills. Easily accommodate oversized scoops and clean the bottle with ease thanks to the extra-wide opening. The rounded base on the Pro45 allows the Blender Ball to mix every last bit of powder and its adjustable carry loop is surprisingly handy, freeing up your hands for keys, your phone, etc. Whether it's protein, a mass gainer, or just plain water, you can rest assured that you've got a tight seal. Like all Blender Bottle brand shaker cups, the Pro45 is proudly made using high quality, BPA- and Phthalate-free materials.