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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 classic backpack.
Material
Vegetable tanned leather, thickness 1.8-2mm
Waxed thread - 0.8mm
Holes for the seam - 1mm with a step of 5mm (in some areas of the rounding, the step floats from 4.85 to 5.1 mm, so I hit everything with a single punch).
Size: Height x Width x Depth - 24cm x 20cm x 8cm
English (United Kingdom)