No Room for a Closet? Costco’s Cube Unit Creates One Behind the Sofa

At 31.1 inches high, the Costco O’nin Room Divider looks more like a low console than a wall, and that is exactly why it works. Made for Costco by Bayside Furnishings, the 8-cube unit can separate a bed from a living area or organize an open closet without swallowing the room.

The common mistake is asking this compact frame to do a wardrobe's job or provide privacy it was never designed to offer. Use it as a low zone marker, anchor it properly, and let the included bins handle the practical clutter.

What you will find inside

• Use It to Zone the Room, Not Seal It Off
• Measure the 15.3-Inch Footprint Before Assembly
• Anchor the Frame Before Adding Storage
• Style the Open Back From Both Sides
• Float It Behind the Sofa With Purpose
• Build the Closet Around Folded Clothing
• Give Every Fabric Bin a Specific Role
• Choose Horizontal Placement for Low Boundaries
• Use Vertical Placement Only With a Clear Plan
• Let the Melamine Finish Set the Palette
• Compare the Complete Cost With IKEA
• Add Privacy With Supported Hardware

Use It to Zone the Room, Not Seal It Off

The Bayside Furnishings O’nin Room Divider is 31.1 inches high, so it creates a boundary without hiding a bed, desk, or sofa at eye level. Treat the 8-cube frame as a low architectural pause, especially in a studio where daylight and airflow matter.

Place it perpendicular to a wall with the 58.6-inch side extending into the room. The result feels intentional when it separates a sleeping zone from a living area while keeping both spaces visually connected.

Measure the 15.3-Inch Footprint Before Assembly

The Costco unit is 58.6 inches wide and 15.3 inches deep, a useful footprint behind a sofa but a surprisingly tight fit beside a bed or narrow walkway. Mark those dimensions on the floor with painter's tape before opening the box.

Leave enough room for doors, drawers, and daily movement around the unit. A divider that blocks the path to a closet will make the room feel smaller, no matter how tidy its eight cubbies look.

Anchor the Frame Before Adding Storage

The Bayside Furnishings organizer weighs about 90.8 pounds and includes anti-tip hardware intended to secure it to a wall. Install that hardware before filling the cubes, particularly when the unit is used vertically or positioned where children and pets move through the room.

Use the assembly directions for the wall type and fasteners involved. The cam-lock and dowel construction gives the frame a furniture-like feel, but careful anchoring is what makes a freestanding divider suitable for everyday use.

Style the Open Back From Both Sides

The melamine veneer frame has an open back, so the surface facing the bedroom is just as visible as the surface facing the living room. Leaving one side unfinished makes the divider read like the back of a bookcase.

Give each face a job: books and a framed print toward the living area, then folded clothing, a small basket, or charging accessories toward the bed. Repeating one finish on both sides helps the unit look like a room element rather than a storage box.

Float It Behind the Sofa With Purpose

Behind a floating sofa, the Costco O’nin unit works as a shallow console-height shelf and a soft boundary between seating and the rest of an open plan. Keep the long side parallel to the sofa so the proportions feel connected.

Use the public-facing cubes for books, a low plant, or a few framed objects, while keeping private clutter on the opposite side. The strongest arrangement leaves some openings visible instead of packing every square inch with accessories.

Build the Closet Around Folded Clothing

The O’nin 8-cube organizer works well as an open closet system for folded shirts, sweaters, shoes, bags, and handled bins. It is not a full-height wardrobe and does not include a true hanging rail, so plan the storage around items that can live on shelves.

Keep frequently worn clothing between waist and shoulder height, then reserve the lower cubes for shoes or laundry accessories. A nearby garment rack can handle hanging pieces, but the cube unit should remain the stable folding center of the closet.

Give Every Fabric Bin a Specific Role

All eight fabric bins are included, and each cube is sized for a bin measuring about 12.9 inches wide, 14.5 inches deep, and 12.7 inches high. That makes the set useful for soft goods, but identical bins can also hide a confusing mix of belongings.

Assign each bin one category, such as socks, workout clothes, accessories, linens, or seasonal pieces. Label the handles if the unit serves a shared bedroom, because a simple category system keeps the open closet from becoming a daily rummage zone.

Choose Horizontal Placement for Low Boundaries

Used horizontally, the Costco cube unit forms four cubbies across and two rows high, landing at roughly waist height for most adults. This is the convincing orientation for a sofa-back divider, a bed boundary, or a desk zone in a studio.

Its low profile keeps sightlines open across the room. Arrange heavier-looking storage toward the bottom and lighter objects above, then keep the top surface mostly clear so it can work as a shelf rather than a crowded ledge.

Use Vertical Placement Only With a Clear Plan

The Bayside Furnishings frame can also be used vertically, which gives the closet more height and creates a taller visual marker in the room. That orientation changes the safety and access picture, so confirm the assembly instructions before treating it as a freestanding wall.

A vertical arrangement is best against a wall or at the edge of a defined zone, with anti-tip hardware installed. Avoid assuming that turning the unit upright automatically makes it a wardrobe, because the open cubbies still have no hanging rail.

Let the Melamine Finish Set the Palette

The melamine veneer gives the cube unit a consistent surface, so surrounding it with too many competing wood tones can make the setup feel pieced together. Pull one supporting color from the frame for baskets, bedding, or a nearby desk chair.

For a closet, keep most bins in one quiet neutral and allow only a few open cubes to display color. For a room divider, repeat the finish in a tray or picture frame so the organizer feels connected to the furniture around it.

Compare the Complete Cost With IKEA

The Costco version typically costs about $130 to $180 with eight fabric bins included. A comparable IKEA KALLAX 2-by-4 unit typically costs about $80 to $130, but inserts usually cost extra.

Compare the finished setup, not the empty frame price. The Costco package can be the better value when the bins are already part of the plan, while a lower-cost laminate organizer may be a false economy if it feels too light for a freestanding divider.

Add Privacy With Supported Hardware

The Costco O’nin unit defines zones, but its open cubbies cannot provide full-height privacy around a bed. If the sleeping area needs more screening, use a curtain track behind it only when the wall, ceiling, and installation method can support that addition.

Do not stack another cube unit above the frame unless the manufacturer's safety and assembly instructions specifically support that arrangement. A carefully installed curtain creates privacy while preserving airflow, whereas an improvised stack can turn a useful divider into a hazard.

Keep reading

• Cramped Living Room? This Sofa Placement Rule Opens Up Space
• 12 Best IKEA Room Divider Finds for Open Floor Plans Under $150

Start by taping out the 58.6-by-15.3-inch footprint, then decide whether the room needs folded storage, a sofa-back shelf, or a bed boundary. Once the placement works, secure the frame before filling the cubes, and add a properly supported curtain only where real privacy is necessary.