a container can be configured as either a bottle or a drinking vessel . the bottle has a base which is detachable . a drinking vessel is formed by removing the base from the hollow body of the bottle , inverting the hollow body of the bottle , and reattaching the top of the bottle to the base . in the bottle configuration , a locking band connects the base of the bottle to the hollow body of the bottle . the locking band also acts as a tamper - evident seal .