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Here's two, DIY, FREE, emergency water canteens you can collapse into a pocket or mini survival kit. UPDATE: Viewer Logic Bob correctly points out: "To reinflate the more stubborn bottles the rest of the way, get it inflated like you did, then put the cap on and squeeze it in the middle to pop the ends back into shape. Then just use your breath to easily reinflate the dented middle section"
After I made the video I also came to discover that removing the bottle's label looks classier and may even allow it to be rolled up a tad more compactly. Keep in mind these containers are not meant for repeated use and the thin plastic can fatigue, crack, and leak from the added stress and folding. Kinks and folds also can become areas where bacterial growth may occur. I consider these as emergency use items but I don't recommend them as primary methods to carry water.
Read how transparent plastic containers can disinfect clear water via sunlight here: en.wikipedia.org/wiki/Solar_w...