Blue, snap-on handles fit the necks of all sizes of Better-Bottle carboys, and you will only need a few for all of your carboys. The blue handles have a comfortable grip and are made of durable, reinforced plastic. Carboys do not tip when they are lifted with the blue handles, so their contents are not be disturbed.
Blue handles are designed for carrying Better-Bottle carboys in suitcase fashion. Blue handles are not designed for lifting carboys at an angle with two hands in order to place the carboys on shelves or to pour from the necks of the carboys, because the handles may disengage.