Perfectly sized for Aesop mouthwash bottles. When attached to the bottle, the height is approximately 23cm. This pump can also be used with other 500ml Aesop bottles, such as body wash. Aesop does not sell dedicated pumps, so this is likely your best option. Also, pumps that perfectly fit Aesop's bottle openings are not readily available. You'll no longer have the stress of opening the cap each time and pouring from the heavy glass bottle. When attached to mouthwash, the bottom of the pump will be about 2cm above the bottom of the bottle, so you'll need to open the bottle for the last use. The second photo shows a personal item with the same pump attached. Discounts are available for multiple purchases only.