A security device includes a housing and a strap which extends from the housing and loops around a bottle neck or other item to secure the device thereto. A locking mechanism lockably engages the strap when the strap is inserted into the housing to secure the strap in a locked position. The housing has first and second opposed outer surfaces which taper outwardly and toward one another in a manner which makes the housing difficult to grasp manually or otherwise, thus helping prevent the breakage and removal of the device from the bottle. The tapered outer surfaces also serve to deflect impact forces to the housing to help prevent unauthorized removal of the device.