“Baby Soda Bottles” are 2-liter bottles before they’ve been heated and formed into their soda bottle shape. In this pre-bottle stage, they make waterproof, hard-to-crush containers for small objects, and they hold approximately 2 ounces of liquid which makes them useful for air travel. Oh also, you can use regular 2-liter bottle caps on them.

“Baby Soda Bottles” [CoolTools]

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