Can also be used as an envelope for carrying items securely.
It's disposable, recyclable, sustainable, environmentally friendly plus widely and freely available.
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Signing UpStep 1Making a paper square from a rectangular sheet
You are going to use basic paper folding techniques to crop it square.
Use your finger/thumb nails to form sharp, straight creases. If your nails are too short, use the edge of something like a credit card or a plastic ruler.
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There are some useful suggestions amngst the comments about this 'ible.
Tried it at home went into the kitchen, i managed to refill it from tap 8 times, and after that the only damage was a small leak from the bottom, i can imagine this was only bec8ause the water from the tap was hitting it hard. 8 times refill from standardd white A4 paper. Genius.
Another thing, I sometimes make a second one out of wax paper or tin foil if I need a drink of water, and put it inside the paper one. Kept the two in my back pocket when visiting another city a few years ago.