Embodiments herein relate to systems, apparatuses, techniques, or processes for packages that include multiple glass layers within the package. In embodiments, a core of the package may include multiple glass layers that may be bonded together, or may be separated by a dielectric layer between glass layers. In embodiments, the glass layers may include one or more electrically conductive features, such as conductive vias, conductive planes, electrical pads, electrical traces, redistribution layer, capacitors, inductors, active dies and/or passive dies. Other embodiments may be described and/or claimed.