A combination comprising a carrier and self-locating container, said carrier including at least one container receiving pocket, said pocket having an inlet with a cross-section to receive a container in any angular displacement about the pocket axis and an internal, plane cam surface located opposite to said opening, said cam surface being inclined at an acute angle to the pocket axis for angular aligning during positioning within said pocket a container having a complementary cam surface, and a container having a cam surface complementary to the cam surface of said pocket, whereby said container is aligned in a predetermined angular displacement by and with respect to the cam surface of the pocket during positioning within said carrier pocket.