Tins include metal boxes and cans, but also glass bottle caps, waste that features a very high concentration of metal and only 1% of residual materials. Among the shelf-life solutions proposed by large-scale retailers, the tin can remains the perfectly recyclable enclosure providing an ideal ratio between raw material obtained and energy used. These materials can practically be recovered without end and, respect to the primary production of new containers, recycling significantly reduces energy consumption and CO2 emissions with great advantages on an ecological and economical level.