How to make a leather Donut Purse that converts into a Backpack

Leather working patterns. Make a leather Donut Purse, a Donut Backpack, or one that converts to both!
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Four different strap sizes for kids, teens, adults, and large adults.
Three different thicknesses, wide for more room as a backpack, Standard for use as a purse and backpack (Standard also has the most realistic proportions), and small for a sleeker looking purse if you'd prefer.
You may also use Conchos, small gems, or anything else your imagination comes up with for the sprinkles.

The purse measures 12-1/8" Wide, the three thicknesses are 3-1/2", 4", or 4-1/2".
(The purse measures 30.8cm Wide, the three thicknesses are 8.9cm, 10.2cm, or 11.5cm.)

Backstory:
I had finished the Taco purse and I was watching a show with my youngest daughter. One of the characters Kimmy (You may know the show) was carrying a Donut Purse.... My daughter looked at me with some pretty big eyes. So I decided to make her a donut purse for her birthday. While I was working on it my older daughter said "Hey, that would make a cool backpack.......". "Brilliant!" I said. And I got right to it.

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