The short answer: buy a bookcase if you store books and want a back panel that stops the frame from racking; buy an open shelving unit if you rotate bins, baskets and decor and want deeper, more flexible compartments. For most living rooms the decision comes down to two numbers: shelf depth (28 cm vs 40 cm) and how much weight each shelf carries.
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Depth decides what actually fits
A typical paperback is 12–15 cm deep, a hardback 15–20 cm, and a magazine file or display trophy sits at 22–28 cm. That is why standard bookcases run 24–30 cm deep — our 70 × 24 × 178 cm zig-zag shelf holds paperbacks perfectly while staying visually light. Once you store archive boxes (typically 38–40 cm deep), folded linens or printer paper boxes, 24 cm is not enough: lids overhang and nothing closes. Go 40 cm or deeper for box storage, 24–30 cm for books and display.
| What you store | Typical depth | Shelf depth you need |
|---|---|---|
| Paperbacks, small plants | 12–18 cm | 20–24 cm |
| Hardbacks, photo frames | 18–25 cm | 24–30 cm |
| Magazine files, baskets | 25–30 cm | 30–35 cm |
| Archive boxes, folded towels | 35–40 cm | 40 cm+ |
Back panels stop the wobble
A thin (3–5 mm) back panel nailed to a bookcase squares the whole carcass. Without one, a tall narrow unit can lean sideways under load — a 180 cm cabinet with 20 kg per shelf applies real racking force every time you nudge it. Open shelving units compensate with thicker side panels or wall anchoring. Rule of thumb: any unit taller than 150 cm should be fixed to the wall regardless of format; in homes with children it is non-negotiable.
Open shelves vs doors: dust and loads
Open shelves collect dust at roughly 0.5–1 mm per month on unused surfaces — fine for plants and pottery, tedious for 200 books. A unit with two or three door sections (like our 60 × 24 × 182 cm cabinet) hides clutter while keeping display rows open. On weight: particleboard shelves 18–20 mm thick carry 15–25 kg distributed per 80 cm span; solid wood 25 mm spans reach 30–40 kg. Store the heaviest items on the bottom two shelves to keep the centre of gravity low — below roughly one third of the unit height.
Adjustability is the quiet dealbreaker
Books have few heights, so fixed shelves work. Baskets, printers and toy bins do not: shelf pin holes at 32 mm spacing let you respace shelves as storage changes. If a listing does not state adjustable shelves, assume fixed. Also check shelf-to-shelf clearance for the tallest item you own — measure it, add 2 cm of air, and confirm at least one bay matches that number.
Choosing in one line
Heavy books, wall-anchored, 24–30 cm deep, back panel → bookcase. Mixed bins and decor, 40 cm+ deep, adjustable shelves, anchor to wall → shelving unit. Measure your wall width and subtract 5–10 cm of breathing room so the unit never looks wedged in.
Common sizing mistakes
Three come up repeatedly. First: measuring shelf depth but not ceiling height - a 178 cm unit under a 240 cm ceiling leaves 62 cm of dead air above it, and that gap invites the topple. Second: buying two narrow units instead of one wide one; a pair of 90 cm units loses 4-6 cm to joining walls and looks busier than a single 176 cm carcass. Third: ignoring skirting boards - a back panel sits 1-2 cm proud, and against a 12 cm skirting the unit either floats forward or leans. A 2 cm spacer behind the top fixes the lean in ten minutes.
Keep reading
More dimension guides are in the collection, and the full index is on the furnolio journal.
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