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Before you express your indignation at me that I posted your pattern, file an industrial patent for your pattern. Almost all patterns have a commonly used solution or are shamelessly copied from normal manufacturers.
Free pattern Large backpack from Workshop Crane.
Folded size: 300x440x160 mm and 300x440x135 mm.
Number of patterns: 17 pcs and 24.
Marking for the punch with a step of 6 mm (+\- 0.15).
Calculations for bends were made for skin with a thickness of 2.2-2.4 mm.
English (United Kingdom)