It is very important to reuse old materials like water bottles and plastic bags after using them once. Although after we use them once they may just look like trash they actually have many uses. For example, next time you have a plastic bag, don't just throw it away. Use it a few more times as a lunch bag and throw it away once it is no longer usable. Also, if you are a crafty person you can use old water bottles and packaging to make cool works of art or fun crafts.