I recently bought a 10 drawer cabinet to organize some of my "raw materials".
Help I'm a Hoarder comes to mind.
I like the cabinet and do recommend it. I picked my up for about $35. If you want to locate it online, you will likely get a hit by googling: Storage Cart - 10 Drawer
As seen in the photos, it is essentially a stack of plastic trays each of which slides into "C" tracks on the left/right sides. Unfortunately, when the tray gets a bit heavy, it does flex a bit which contorts the geometry of the top of the tray.
The trays tend to pull inward and thus can come "off track" when sliding on the rails.
To fix the problem, I installed a reinforcement which spans the top of each tray.
I used some scrap wood found in the garage. To make the result more clean, I used rivets instead of screws.
Step 1: What You Need
Small Pieces of Wood
and of course you'll need a set of drawers!
Step 2: Droopy Drawers
Step 3: Fix the Problem
You'll need one board for every shelf that you want reinforced. I did all ten.
Step 4: Drill Holes for the Rivets
Also you will need to drill holes in the ends of the wood pieces. This is CRITICAL. If you do not drill a wide enough hole, you will likely split the woodl. I drilled all my holes (shelves and wood) at .125 inches (that's 1/8 inch). I chose that size because that is the size of the rivets I used.