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UPD: Updated handle form for easier assembly.

This bag will definitely make people around you pay attention to you. Just print and assemble it. 

After printing handle glue it togeather using pin inserts for greater strength.

Only hardware part you`ll need is 2pcs spring gate ring 35mm in diameter and 5mm thickness.

The inner insert was made in a local sewing studio, so there is no diagram of it, but its dimensions should be 180*55*90mm. And also two loops are sewn on each side to fix the insert in the bag.