From the minutes at my old bike collective, where they had been using double-wide filing cabinets as parts storage:

Large parts filing cabinet fell suddenly and catastrophically, no injuries, single most dangerous thing to happen in shop history, we are very fortunate.
We CANNOT use double-wide cabinets ever again, they are too potentially dangerous the way we use them.

Beware of storing parts in any kind of drawers that could be top-heavy. After years of working just fine, they could spontaneously come crashing to the floor.