a display package including a package sleeve and one or more end caps slideably inserted into the package sleeve . the package sleeve may have at least one open sleeve end and may define at least one transparent viewing window . the package sleeve may also have at least one foldable end flap which may be folded inward toward the main end cap section with a portion thereof inserted through a respective lock slot in the main cap section , thus locking the end cap in place . the one or more end caps may be designed to alter the shape of a package sleeve such as to increase the efficiency and ease of both the package assembly and product loading . the sleeve and end caps may be formed from a variety of materials including paper based materials or plastic based materials .