We purchased this set on a whim while at the store buying formula. We had forgotten the formula when leaving the house, so we stopped at the store for a new tub & I grabbed this dispenser so I wouldn’t need to bring the tub with us all day. Little did I know that the one serving add on part would be one of my favorite things. Going for a walk around the block? Just bring the 1 serving. Headed to the playground? Only need 1 serving. It was so tiny and so handy I was very happy to have it on many occasions!