Instead of discarding plastic bottles, why not turn them into nifty zippered organizers for stashing small items like pens, toys or hair accessories?
The two plastic bottles that are the same. Cut off the bottom from one bottle and the tapered top from the second. Discard the ends with the screw top. Take a zipper that is long enough to reach all the way around the bottle and hot glue one side to the larger bottle portion as shown. Open the zipper at attach the other side of the zipper to the shorter bottle bottom section. Now you have a hand, upcycled and inexpensive organizer for any small, loose items.