If you own an IKEA Kallax shelf unit, you already know it's one of the most versatile storage pieces you can buy. But a row of open cubes can quickly become a row of open chaos — especially in a craft room, home office, or living space where you're storing everything from yarn to board games to 12×12 scrapbook paper.

This guide walks you through exactly how to organize a Kallax shelf, cube by cube, so every inch of storage is working for you.

Why the Kallax Is a Craft Room Favorite

The IKEA Kallax shelf unit measures 13-3/16" wide × 13-3/16" tall × 15" deep per cube — a near-perfect square that's deep enough to hold bulky supplies and wide enough to display them. It's modular, affordable, and available in multiple configurations (2×2, 4×4, 5×5, and more), which makes it a go-to for crafters, gamers, and home organizers alike.

The challenge? Open cubes don't organize themselves. Without the right inserts and accessories, you end up with a shelf that looks messy no matter how often you tidy it.

Step 1: Sort Your Supplies by Category

Before you touch the shelf, pull everything out and sort it into categories. Common groupings for craft rooms include:

• Yarn and fiber (skeins, balls, cones)
• Paper and cardstock (12×12 sheets, notebooks, sketchbooks)
• Fabric and rolls (fat quarters, bolt ends, interfacing)
• Tools and notions (scissors, rulers, rotary cutters)
• Finished projects or works in progress

Sorting first lets you assign one category per cube — which is the key to a shelf that stays organized long-term.

Step 2: Use Cube Inserts to Subdivide Your Space

Open cubes are great for large items, but they're inefficient for smaller supplies that tend to tip, roll, or pile up. That's where cube storage inserts come in.

Two inserts work especially well for Kallax shelves:

X Divider Cube Insert

The X Divider Cube Insert splits a single cube into four equal quadrants using two interlocking boards — no tools required. It's ideal for storing yarn skeins, wine bottles, spray cans, or rolls of fabric and paper upright and separated. Each quadrant keeps items from leaning into each other, so your cube stays tidy between uses.

Our X Divider is custom-sized for the IKEA Kallax (13-3/16" × 13-3/16" × 15" deep) and available in unfinished MDF or white melamine — so it blends right into your shelf.

Adjustable Shelf Organizer Cube Insert

The Adjustable Shelf Organizer Cube Insert adds one or more horizontal shelves inside a cube, turning a single open space into a mini bookcase. It's perfect for 12×12 paper, puzzles, board games, figurines, or any flat items that need to stand upright. The shelf height is fully adjustable with 9 sets of pin holes, so you can configure it for whatever you're storing.

This insert works best when the Kallax is placed against a wall or has a back panel, and it cannot be used vertically — keep that in mind when planning your layout.

Step 3: Assign a Purpose to Every Cube

Once you have your inserts, map out your shelf before you start loading it. A simple approach:

• Top row: Display items or less-used supplies (finished projects, seasonal materials)
• Middle rows: Active supplies you reach for daily (current projects, most-used tools)
• Bottom row: Heavier items or bulk storage (fabric yardage, paper reams, bins)

Assign your X Divider cubes to yarn, bottles, or rolls. Assign your Adjustable Shelf cubes to paper, books, or flat items. Leave a cube or two open for bins or baskets if you have loose small items that don't fit neatly into either category.

Step 4: Label and Maintain

Labels are optional but make a big difference if multiple people use the space — or if you tend to "temporarily" set things in the wrong cube. Simple adhesive labels on the inside edge of each cube are enough. You don't need anything fancy.

Once a month, do a quick reset: pull out anything that's migrated to the wrong cube and put it back. A five-minute reset is all it takes to keep a well-organized Kallax looking great.

The Bottom Line

Organizing a Kallax shelf comes down to three things: sorting your supplies, using the right inserts to subdivide your cubes, and assigning a clear purpose to every space. With an X Divider for upright storage and an Adjustable Shelf Insert for flat items, you can turn any Kallax into a fully functional, easy-to-maintain storage system — no baskets required.

Ready to get started? Shop our X Divider Cube Insert and Adjustable Shelf Organizer Cube Insert, both custom-sized for the IKEA Kallax.