Scope: small hardware and consumable add-ons that adapt or protect existing storage furniture/containers — drawer & bin dividers/separators, labels & label holders, bin/container hardware (stacking connectors, casters, lid racks), closet rod & shelf hardware (extenders, brackets, supports), and moisture/pest protection inserts (desiccant, cedar, mothballs). Excludes the bins/boxes themselves (storage-containers), insert trays (organizer-inserts), hangers/hooks (hangers), cable organizers (cable-management), shelf/drawer liners (shelf-drawer-liners).

Seed:
1. Equivalent of treadwear grade: regulatory_status (EPA-registered pesticide vs not) on moisture/pest accessories — on every mothball/cedar package, still needs a judgement because "pesticide" changes what's safe to use around food and kids.
2. What an expert (professional organizer) notices first that a novice wouldn't: most of this hardware is sold to match one specific storage system's rim, rail, or rod profile rather than being universal — so the real spec is compatibility, not material or size.

Sources:
[ikea_catalog] https://www.ikea.com/us/en/cat/storage-organisation-st001/ — accessories are commonly sold matched to one product line, not universal — verbatim: "Accessories for ENHET" / "Accessories for KNOXHULT" / "Accessories for SUNNERSTA" / "Accessories for TROTTEN" as separate subcategories; also lists "Drawer dividers" and "Shelf brackets" as distinct real retail subcategories
[containerstore_nav] https://www.containerstore.com/s/storage/storage-accessories/12d — labels/label-holders and cord control are real retail subcategories distinct from bins — verbatim nav names: "Labels & Label Makers", "Cord Control", "Bins & Baskets"
[wikipedia_mothball] https://en.wikipedia.org/wiki/Mothball — mothballs are classed as chemical pesticide/fumigant; cedar cited as alternative — verbatim: "Mothballs are small balls of chemical pesticide and deodorant"; "Red cedar wood and oil is also used as an alternative moth repellent"
[wikipedia_naphthalene] https://en.wikipedia.org/wiki/Naphthalene — corroborates fumigant/pesticide classification — verbatim: "Naphthalene has been used as a fumigant... fumigant pesticide"
[wikipedia_silica_gel] https://en.wikipedia.org/wiki/Silica_gel — silica gel desiccant can be regenerated (dried) and reused — verbatim: "Once saturated with water, the gel may be regenerated by heating... conventional heating in an oven"
[wikipedia_cedar_oil] https://en.wikipedia.org/wiki/Cedar_oil — cedar scent fades and is renewed; used as insect repellent — verbatim: "it can also be used to renew the smell of natural cedar furniture"; "Cedarwood oil is used as an insect repellent"
[npic_naphthalene] https://npic.orst.edu/factsheets/naphgen.html — naphthalene mothballs are EPA-registered pesticide products, not just "chemical pesticide" generically — verbatim: "There are over a dozen products containing naphthalene registered for use by the U.S. Environmental Protection Agency (U.S. EPA)"; "Naphthalene was first registered as a pesticide in the United States in 1948"

Branches:
- accessory_type=dividers_separators -> divider facets matter, label/hardware/rod/protection facets irrelevant: a divider's own material/mounting has nothing in common with a label's format or a mothball's mechanism.
- accessory_type=labels_and_label_holders -> label facets matter, divider/hardware/rod/protection facets irrelevant: how a label attaches has nothing in common with divider or hardware mounting.
- accessory_type=bin_and_container_hardware -> hardware_subtype matters first (gates caster/connector questions), divider/label/rod/protection facets irrelevant: which bin-hardware job it does is unrelated to divider or label questions.
- accessory_type=moisture_and_pest_protection -> protection_mechanism/regulatory_status matter, divider/label/rod facets irrelevant: supported by mothball vs cedar being governed by pesticide classification, an entirely different axis than material/mounting.
- accessory_type=closet_rod_and_shelf_hardware -> rod/shelf facets matter, divider_mounting (clip-on-to-bin-wall) irrelevant: there's no bin wall on a closet rod system.
- storage_system_target=drawer -> divider facets matter, mounting_type (wall bracket) irrelevant: a drawer divider doesn't mount to a wall.
- storage_system_target=closet_rod_or_shelving -> rod/shelf facets matter, divider_mounting irrelevant: a rod bracket doesn't friction-fit into a drawer.
- storage_system_target=stackable_bin_or_tote -> hardware_subtype matters, divider/mounting-type facets irrelevant: bin hardware's job is unrelated to a drawer divider's mounting.
- storage_system_target=open_shelf_or_pantry -> rod/shelf facets matter (same set as closet_rod_or_shelving), divider_mounting irrelevant: open shelving uses the same support/clip hardware as a closet wire shelf.
- hardware_subtype=caster_wheel_kit -> caster_lock_type matters, connector_bin_compatibility irrelevant: a caster's lock type is unrelated to a stacking clip's fit.
- hardware_subtype=stacking_connector_clip -> connector_bin_compatibility matters, caster_lock_type irrelevant: a clip's fit is unrelated to a caster's lock type.
- hardware_subtype=locking_buckle_latch / lid_rack_or_organizer -> neither caster_lock_type nor connector_bin_compatibility applies: a latch or lid rack has no wheels and no bin-rim fit to grip.

Noise (rows seen on IKEA/Container Store nav, left out):
- Curtain rods, rails & holders / curtain hardware (IKEA) — window treatment, not storage.
- Cabinet hinges & dampers, Knobs and handles (IKEA) — general furniture hardware, not storage-specific.
- Room dividers, Desk dividers (IKEA) — furniture/space dividers, not storage accessories.
- Bulletin/peg boards (IKEA) — wall organization, sibling category (hooks & wall organization).
- Bins & Baskets, Carts & Accessories (Container Store) — the containers themselves, sibling (storage-containers).
- Cord Control (Container Store) — sibling (cable-management).
- Bottles & Medication (Container Store) — sibling (containers).

Scope boundaries:
- label_format=label_maker_printed_tape edges toward the sibling `labels` leaf (stationery: "Labels, Tabs & Laminating Supplies"); kept here because the tape is sold and used as a storage-bin label, not as a general stationery product.
- storage_system_target=open_shelf_or_pantry edges toward the sibling `kitchen-organizers` leaf (pantry shelving); kept here because its hardware (shelf support clips, brackets) is the same generic shelf-support hardware as closet wire shelving, not a kitchen-specific insert.

Corrections (2026-10-26):
- regulatory_status's "EPA-registered pesticide" claim was uncited; added [npic_naphthalene] (NPIC fact sheet, fetched directly) stating naphthalene mothball products are registered for use by the U.S. EPA, and cited it on the facet.
- Added branches for storage_system_target's two dead-end values (stackable_bin_or_tote -> hardware_subtype; open_shelf_or_pantry -> rod/shelf facets) so all four values route somewhere.
- Promoted hardware_subtype to a third top-level split with its own branches, so caster_lock_type and connector_bin_compatibility are asked only for the matching hardware_subtype value, not unconditionally; updated bin_and_container_hardware's then_ask and the drawer/closet_rod_or_shelving branches' makes_irrelevant to route correctly (verified against tree.py's flowchart output).
- Added vocabulary entries for "Paradichlorobenzene" and "Friction-fit".
- Reclassified reusability from source:researched/backfill_cost:medium to source:listing/backfill_cost:low, matching its own listing_field_hint (title-keyword signal).
- Raised connector_bin_compatibility's backfill_cost from medium to high (cross-catalog product-line matching, not a single-listing read).
- Added the missing branch lines and two scope-boundary lines above (label_maker_printed_tape vs. `labels`; open_shelf_or_pantry vs. `kitchen-organizers`).