KALLAX Shelf unit, white, 30 1/8x30 1/8″
+11¾″ margin
All items that fit a Mazda CX-5 2023
Will fit in a ?
No, it won't fit.
It will not fit in this setup: BILLY Bookcase, oak effect, 31 1/2x11x79 1/2″ is too large for a Mazda CX-5 2023 with seats up.
Fit Details
With seats up, This package will not fit in this setup. The blocker is cargo width, and you're short by 21⅜″ even with diagonal loading. We're about 95% confident in this estimate.
BILLY Bookcase, oak effect, 31 1/2x11x79 1/2″
Box: 81¼″ × 11¾″ × 5″ · 87 lb 5 oz
Based on IKEA US (United States).
Package dimensions last checked and updated on Oct 21, 2026
Package
Status
Limiting factor
Best orientation
Package #1
81¼″ × 11¾″ × 5″
Status:21⅜″ short
Limited by
Limiting factor:Cargo width
Best orientation:Diagonal
Vehicle limits
Opening width / height above sill
41¾″ / 29⅛″
Cargo width / height
41⅜″ / 31⅛″
Cargo length seats up / down
37¾″ / 66⅞″
Loading sill height
29⅞″
Mazda CX-5 2023
Measurements last checked and updated on Oct 21, 2026
Helpful tips
Use these loading tips to improve your chances of fitting BILLY Bookcase, oak effect, 31 1/2x11x79 1/2″ in Mazda CX-5 2023.
Use available cargo width
Center the package between the side walls before final rotation.
Load diagonally first
Load diagonally first, then straighten once inside.
Try fitting alternatives
Check the Similar items that fit section for safer alternatives.
Alternatives that fit in Mazda CX-5 2023
Ranked by fit margin and package-dimension similarity. This improves as we index more items.
About the Mazda CX-5 2023 boot
Width barely changes from the CX-5's tailgate to its floor: 41¾″ at the opening and 41⅜″ at the floor's narrowest point. Tall boxes do well too, with a 29⅛″ clear gap over the loading sill and a floor only 2″ below the sill, so the boot is 31⅛″ tall from its floor. The floor runs 37¾″ with the rear seats up and 66⅞″ with them down. With the seats up, some boxes longer than 37¾″ still fit at an angle, on their side. Get a second person for heavy boxes: the sill sits 29⅞″ off the ground.
About the BILLY Bookcase, oak effect, 31 1/2x11x79 1/2″ package
Heavy and long is a hard mix, and the oak effect BILLY box is both: 81¼″ × 11¾″ × 5″, at 87 lb 5 oz. It is narrow, but that is far too much weight over that length for one person. Placed straight, the box spans 81¼″ of boot floor. Plan the lift before you make it: who takes which end, which way you walk, and where the box goes down. With 87 lb 5 oz between you, neither of you should have to change grip halfway.
Frequently asked questions
Find quick answers about fit for BILLY Bookcase, oak effect, 31 1/2x11x79 1/2″ in Mazda CX-5 2023, including seats up vs seats down, limiting factor, best orientation, and package-by-package margins.
Will BILLY Bookcase, oak effect, 31 1/2x11x79 1/2″ fit in Mazda CX-5 2023?
No. With seats up, it is short by 21⅜″ at Cargo width, even with diagonal loading.
What is the tightest part?
The limiting factor is Cargo width, with -21⅜″ margin in seats up.
Why does it not fit?
The blocker is Cargo width: with seats up, the box is 21⅜″ bigger than the space there.
Can I load it diagonally?
Yes, diagonal is the best orientation for this check, with -21⅜″ around the limiting point.
How tight is this fit?
This result is in the clear no-fit band (-21⅜″ at Cargo width).
Does it fit with seats up or seats down?
Seats up: No (-21⅜″). Seats down: No (-5⅛″). Default selection follows YES > MAYBE > NO.
What do YES, MAYBE and NO mean here?
YES means there is at least 2⅜″ to spare at the tightest point, in the best way the box can go in. MAYBE means it fits on paper, but with less than 2⅜″ to spare, so trim, the parcel shelf or the loading angle can decide it. NO means the box is bigger than the space at its tightest point, whichever way it goes in. Every margin on this page is that real gap: the car's measurement minus the box's.
What should I do instead?
Use the Helpful tips & alternatives section to choose a smaller item, different orientation, or split-load plan.
Which loading orientation works best?
Diagonal is the best orientation for this result in seats up.
How confident is this result?
Confidence is 95 out of 100 based on available dimensions and margin tightness.