This is the best storage option I've found so far. Don't have room for a peg board as I sew in my dining room. It's on wheels so I can move it easily. I'm storing my printed patterns also. I found this rolling file at a thrift store
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The thing I like is that I can store my rulers & templates with the instructions. Although hanging folders have been suggested before, this unit allows me to make outsized ones. Here's a wide one, made from poster board and 2 canibalized pendaflex metal hanging parts. Rulers stored in these long ones need to be removed from the side of the unit.

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Here's a deep one for my 12.5 X12.5 square up. You can see how I cut the bottom off & extended it.

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Last week I just realized that if I lower the top rail so the tabs are below the posts, I can get my husband to cut a sheet of plywood and make a top. Just what I need, another flat surface.

Mine are in a drawer but will make it to peg board when my son comes back and installs it!

I have a ruler rack for my most used long rulers and I stor all my others in a double deep artbin box

Mine hangs on nails. Smaller rulers stand in the closet in ziploc bags
with their instructions.
The Add a 1/4 inch and other skinny rulers are in a big tumbler.

I have a tall bookcase that I keep supplies etc. on. I put small nails on the side. This allows me to see all of my rulers and templates at a glance.

i have no room for peg board. i sew in my dining room, so no where to put rulers either. and i have lots of rulers ..in a corner between hutch & deck doors/windows i have hung command hooks. all my rulers are up and hanging & not too noticeable if i have the rare dinner guests :) my block book with felt & vinyl pages is hanging there also. up out of way of kitties looking for a nice bed when i'm not sewing.

I may try the pegboard as I have that loaded with everything else. I have them kinda scattered. Just cleaned my sewing room today so now is a good time to hang those rulers!

I have an old mail in out holder that is a step up each slot type. It works great and sits near where I cut my blocks. Two long rulers hang by their lip off the side of the bookcase where they all sit. It would be perfect, except I have misplaced my main cutting ruler. I haven't a clue where I have placed it. I have been using the really long one, but I think it is time to break down and buy another.
As far as the mail holder goes, I must have 15 assorted rulers stored in it. These are the ones I use the most. I also have a drawer in my closet with a few specialty rulers and nails in my closet with quilting templets and rulers hanging there.
I know where they all are and what I have this way.

I have a piece of wood with slots in it. It was originally for holding cookbooks open. My rulers slide in that. But it isn't big enough for all my rulers. So a friend gave me something that she got at Bed and Bath. I don't know what it's called but it looks like something you put file folders in. It's sturdy enough to support my bigger rulers.

Ditto on the pegboard here. And when I'm using them and don't want to hang them, but don't want them in the way I stand them on the floor next to my table legs which are somewhat inset so the rulers aren't in the way.