I made a video on how to draft a simple backpack.
Seamly2D - Drafting a Backpack Pattern
Links to download the pattern are in the video description.
Welcome aboard! I’m glad you’re liking it! Based on the hat story, it would have been nice if the backpack related to a human measurement, like shoulder width or something, but it serves its purpose for the average adult, & can be adjusted, which I think makes it a wonderful tutorial! 
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Thanks!
Human measurements are the eventual goal. The idea for the video started on r/myog where another redditor and I discussed creating a body of knowledge on using Seamly2D for “Make Your Own Gear”. Unfortunately I don’t know how to fit a pack to a person yet. So that will take some research as well as some trial and error, but, I hope to get there one day.
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Hey @PlainsPrepper, feel free to post here any link on Reddit that discusses Seamly2D. It helps with development. Thanks for posting your video here. Hope you don’t mind I made it a pinned topic for a week.
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@slspencer Thanks!
Here is the link to the reddit thread I was talking about.
We may have cracked the patterning nut!! Seamly2D discussion!
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Here’s a quick video about how to use the Right Angle Tool:
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