How to make a ring handle bag (with lining)

The bottom is round and the gusset can be fully inserted from 13cm width.
The handle is a ring handle, so it's stylish and easy to make.
"Completed size"
35cm x 32cm
Gusset 13cm width
"material"
Outer material 42cm x 34cm 2 sheets
Lining 42cm x 34cm 2 pieces
Gusset 15 cm x 82 cm 1 sheet
Ring handle outer diameter 12.5cm 1 pair
(The size of the ring handle is a guideline. It can be made even if there is a slight difference in size.)
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/ @monsewing