Trangia sell bags for their iconic cooking system that feel like they were an afterthought. There are a bunch of diy Trangia bags online however non of them spoke to me.
This is my v1. The drawings have been updated to have both the 27 & 25 size Trangia's in one print out.
If I ever have the honor of Trangia reading this, this is my two cents, wax canvas feels very appropriate material for your stove bags and brand.
Any questions please leave them in the comments on youtube and ill get back to you.
As always, free A4 and A3 printables here. I have included the illustrator file so you can amend the drawings if you would like.