Over on YouTube, Jonathan Flores said he'd love to see a tutorial on how to make a backpack in Marvelous Designer. Unfortunately, I don't have any spare time. Fortunately, I already made one a few years ago.

I'm not sure what version of MD I used, but I opened it in 10 and it seems to be okay. There is no reason for the project file to go to waste when someone could use it, so here you go. Have fun with it and make lots of improvements.

Military Pack in Marvelous Designer