I think She was wanting something to carry back and forth to class, not an at home solution.

If it were me, I would look for a zip-around loose leaf binder. I would buy multiple plastic zipper pencil holders and have a page for each ruler.

I pick up the plastic scrapbooking flat boxes when they go on sale for $3. You can write on the side with a sharpie and they stack nicely on a shelf (and are clear). I use them for most of my crafting supplies. But for fabric blocks or samples or bits and pieces, I love medium size pizza boxes! You can also write on them and, being cardboard, moisture wicks out. Most pizza places will give you a couple if you ask.

How about an expanding artist portfolio or an artist accordion file?

I'm just guessing but you probably know your way around a sewing machine enough to make something that suits your needs exactly. Here's a link to just one site, Olfa, with a pattern for tool tote. Looks like this could be adapted to your needs. Good luck...http://www.olfa.com/blog/blog-OLFA-D...Tool-Tote.html

Here is a new one https://www.kickstarter.com/projects...-rulers-protec