I bought a bunch of oscillating multi-tool blades and found there were not a lot of options for holding a lot of blades in a compact case, so I designed one.  There are three different spacers to help hold the blade end up so they don't tilt too far and jam on the post.

I recommend lubing the mating / sliding surfaces with something to keep the parts from jamming and fusing together.  I put just a small bit of silicone grease on them and it works great.