Is it impossible to repair a stainless steel insulated cup if it is not insulated?

If a stainless steel insulated cup is not insulated, it cannot be repaired for the following reasons:
1) The thermos cup can keep warm because it is made of double-layer stainless steel with vacuum inside. The vacuum insulation layer can slow down the heat dissipation of water and other liquids inside, prevent heat convection, and achieve the purpose of insulation. The insulation cup is not insulated because the vacuum degree cannot be reached, and there is currently no good way to repair it on the market. Therefore, the insulation cup can only be used as a regular cup without insulation.
2) Whether from the perspective of environmental protection or the secondary utilization of resources, both manufacturers and sellers hope that this application function can be realized for insulated cups, but handicrafts have their limitations.
3) Although the vacuum insulated cup cannot be repaired, it can still be used. Although the insulation time is not ideal, it is still a intact cup, which is also a low-carbon and healthy lifestyle.
4) However, it is also important to note that when using vacuum insulated cup products in daily life, they should be properly stored. Especially for products like ceramic cups, glass cups, and purple clay teapots, not to mention repairs, if they are broken, they cannot be used anymore. During use, collision and impact should be avoided to avoid damaging the cup body or plastic, causing insulation failure or water leakage. When tightening the screw plug, apply appropriate force and avoid excessive rotation to prevent the screw buckle from failing.