I had 2 of these plastic 3 drawer storage carts to organize the junk under my desk.
They aren't pretty but they are inexpensive and do the job.
I took off the wheels and they were still a little too tall to really fit. I had to lift up the edge of the desk to access them. I looked at a few stores to see if I could find some that were shorter - but I had no luck. I decided to hacksaw the bottom drawer off so I would only have 2 drawers and it would fit better.
I lifted up my desk and pulled the drawers out. After studying one of them for a bit, the top looked like it wasn't glued - just snapped on.
With a little pulling, it came off. So I took the drawer out...
then pulled the legs off.
And was left with this.
I then snapped the top piece back on and was left with perfectly functioning 2 drawer storage unit.
They both fit perfectly under my desk.
I don't even worry about the way they look because they are hidden behind fabric anyway.
This may seem silly because you already knew these little carts were adjustable, but I had no idea. And it changed my life. OK, maybe that is a little dramatic, but this change sure made accessing my junk a bunch easier!!