For only 3oz of water, the smaller size is much more convenient and comfortable in my belt.

The bottle is a nice size and will fit in most water bottle pouches and pockets.

I like the size and color

At 21 oz, it is just the right size to hold enough water for my short to mid length rides and easily fit in the cage on my hard tail mountain bike.

The right size to hold in my hand with the tappered neck and fits in a bike cage just

Great size for my women’s bike

Good size

The size is perfect for me - it's narrow but not top heavy.

My kids play soccer and love these bottles for game hydration too - quick and easy to drink, easy to squeeze, and perfect size for handling on the go.

Love the size and ease of use and insulation, but after several months the locking mechanism stopped working all together.

Difficult to clean, as with any bottle this size

Like the smaller size.