The invention relates to a sealing disk for a closure of a container having an opening delimited by a circumferential edge, wherein the sealing disk comprises several layers having an edge. The distribution results, in a simple, practical and inexpensive way, for all the services and applications which reliably and efficiently preserve their specific quality of service requirements, in a highly balanced quality of service with best effort character. Also provided are sealed via structures, methods of detecting leakage in a sealed device package, sealed device packages, device packages having cooling structures, and methods of bonding a first component to a second component.