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Rack thread maybe?
Yup: https://www.lfgss.com/comments/13321750/
@jambon great project, going to look (and hopefully feel) awesome!
Re bigxtop bag not working with a decaleur - I just fitted one, of sorts. See CP thread here. My bag has a sheet of plastic between the bag and the liner because I told Jordan I wanted to fit the support there, you might be able to put something there yourself?
Someone on another thread used an insert made from an estate agent's sign to hold their bag's shape. Rack thread maybe? Drawing a blank now. I'm sure someone else will remember it.