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4meAndyou · F
They are thin plastic, and can be squeezed. AND you can use the bottoms as caps for the bottles and make terrariums out of them...and lots of other things!
https://wonderfuldiy.com/2-litre-pop-bottles-upcycling-crafts/
https://wonderfuldiy.com/2-litre-pop-bottles-upcycling-crafts/