MoMatt Report post Posted November 15, 2016 I have a singer 29 that sews best with 69 size thread. I am thinking about making a backpack or book bags for my kids that will take a lot of abuse. Since its so easy to sew back in the same holes with my machine, if I double sew wouldn't I have the advantage equal to stronger lager thread and even much of the look? A test seam looks pretty good to me. If I turned the bag inside out after sewing I think it shouldn't matter at all. I'm also wondering if I don't need as heavy a thread as I think I do. Arthur Porter of youtube fame uses size 69 thread for his projects. Quote Share this post Link to post Share on other sites
