The invention relates to a glass package (100) for sealing a device (120), to a system (110) comprising the glass package, a light source (210), a luminaire (200), a backlighting system (310), and to a display device (300). The glass package according to the invention comprises a first glass substrate (10), a second glass substrate (20), and a seal (30) sealing an interface between the first glass substrate and the second glass substrate. The seal comprises a frit (30) comprising glass. A CTE of the frit is chosen to be at least 10% lower compared to the CTE of the first glass substrate and/or of the second glass substrate. An effect of the glass package according to the invention is that the difference between the CTE of the frit compared to the CTE of the first glass substrate and/or the second glass substrate enables to generate a gas-tight sealed glass package while using a glass-material as the first glass substrate and/or as the second glass substrate which has a relatively high CTE.