29+ What To Put In Glass Jars. Opaque privacy glass is the best glass for bathroom windows. You need to raise the temperature of a glass jar somewhat 'gradually' so it doesn't fracture from the stress of the heat exchange.
Tetra pak are trickier because they are made from various materials which are difficult to recycle.
For glass, this can be recycled many times. Put them in a bowl of boiling water and let them soak for a few hours or even overnight. Opaque privacy glass is the best glass for bathroom windows. However, not everything made of glass is recyclable through metal you can't put in the household recycling.