Life jacket from plastic bottles.
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Previously:
https://www.homemadetools.net/forum/...548#post143081
https://www.homemadetools.net/forum/...617#post174350
https://www.homemadetools.net/forum/...599#post151657
https://www.homemadetools.net/forum/...182#post145710
https://www.homemadetools.net/forum/...083#post115478