Parametric bum bag

Features

• parametric Seamly pattern (resize to your needs)
• zippered front pouch with volume thanks to darts
• zip ends hidden in darts (fiddly)
• public domain licensed

Plans

• parametric pattern
• measurements files (as sewn 18cm x 8cm x 7cm)
• pattern pieces as sewn A4 pdf Inkscape svg

Other peoples versions

Hook

• STL
• Solvespace CAD file

Learning and what I'd do different

• don't use cheap ribbon when you run out of webbing, it don't last
• there is probably a cleverer way to do the adjustable strap so that it can be tightened with a single hand
• if you like wearing in on your right hand side do the strap the other way round to make it easy to put on

Construction

Basic order of operations:

• make front pocket
  • attach zip to extra piece of fabric that will become the top of the front panel
  • position zip on bottom part of front panel and stitch
  • trim the surplus fabric
  • don't forget to insert the zipper slider
  • construct darts, encasing the ends of the zip
    • attach the front pocket lining to the outer front pocket panel
• lining
  • inner pockets
    • hem them
    • attach to lining panels
  • assemble lining by stitching gusset between front and back lining (french seams for brownie points)
• construct outer shell
  • attach any webbing loops you desire to the panels
  • make the wings (follow the Learn MYOG Everyday Fanny Pack process for this)
  • assemble outer shell by sewing gusset to front and back panel (don't forget to attach the wings)
• final assembly
  • sew the lining to the outer after inserting them right sides together
  • leave a gap in the seam so that you can birth the bag
  • top stitch around the top to finish the bag