tabs 34 that may extend radially inward from an inner edge of the opening 32 the retaining tabs 34 may allow the fastening member 30 to be attached to the neck portion 6 such that the doser holder 10 may be retained on the medicine bottle 2 depending upon the size and or the diameter of the opening 32 relative to the neck portion 6 the retaining tabs 34 may be loosely or firmly fastened to the neck portion 6 if the diameter of the opening 32 is smaller than the diameter of the cross section of the neck portion 6 the retaining tabs 34 may twist stretch and or bend to elastically conform to the size shape and or contours of the neck portion 6 as a result the doser holder 10 may be snuggly attached to the medicine bottle 2 conversely if the diameter of the opening 32 is larger than the diameter of the cross section of the neck portion 6 the doser holder 10 may be loosely fitted to the medicine bottle 2 additionally in the preferred embodiment the flexibility of the retaining tabs 34 may allow the doser holder 10 to be fastened to or unfastened from the medicine bottle 2 regardless of whether the cap 4 is installed the retaining tabs 34 may twist stretch and or bend to allow the cap 4 to pass through the opening 32 without tearing and or elastically deforming the doser holder 10 to provide flexibility durability and or strength the thickness of the material may be in a.