What 29 CFR 1910.176 requires (plain English)
29 CFR 1910.176 governs the handling and storage of materials in general industry: how goods are stacked, stored, and moved so they do not fall on, crush, or trip workers. Materials handling is behind a large share of workplace injuries: struck-by from collapsing stacks and falling objects, caught-in from shifting loads, and slips and trips from cluttered aisles. The standard's requirements are practical and inspection-friendly, which is why housekeeping and storage citations are common.
The cornerstone is secure storage. Storage of material must not create a hazard, and bags, containers, bundles, and similar items stored in tiers must be stacked, blocked, interlocked, and limited in height so they are stable and secure against sliding or collapse. A stack that leans, exceeds a safe height, or is not interlocked can come down on a worker without warning. The standard also requires that where mechanical handling equipment is used, sufficient safe clearances be allowed for aisles, at loading docks, through doorways, and wherever turns or passage must be made.
Two more duties round it out. Permanent aisles and passageways must be appropriately marked and kept clear and in good repair, with no obstruction that could create a hazard. And storage areas must be kept free from accumulations of materials that constitute hazards from tripping, fire, explosion, or pest harborage. Together these rules keep the flow of materials through a facility from becoming a source of struck-by, caught-in, and slip-trip-fall injuries: hazards that are easy to see and, for an inspector, easy to cite.