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Step 2The Frame
I got lucky with the frame because I happened to have a piece of aluminum lying around that could be bent to make a square that matched the size of the backpack exactly.
The aluminum was a vertical support from a screen door. It had four spots where it could easily be bent to form five even segments. With one side overlapping, it made a square with sides of about 14 inches. The backpack is also a square with 14 inch sides. How convenient.
The aluminum was a vertical support from a screen door. It had four spots where it could easily be bent to form five even segments. With one side overlapping, it made a square with sides of about 14 inches. The backpack is also a square with 14 inch sides. How convenient.
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