old envelopes:
If it is broken and I will throw it away and if it is not used, I will not throw it and use it simply because people only take money or letters in envelopes they will never notice it if they notice they will be happy to let it go
used water bottles
We can wash it with soap and clean it and reuse it
used books
Used books we will not throw away wasted but for people who are preparing to use the book for their age