KALLAX Shelf unit, white, 30 1/8x30 1/8 "
+2½″ margin
Will fit in a ?
No, it won't fit.
It will not fit in this setup: BILLY Bookcase, white, 31 1/2x11x79 1/2 " is too large for a Fiat 500 Cinquecento 2020 with seats up.
Fit Details
With seats up, This package will not fit in this setup. The blocker is opening width, and you're short by 39⅞″ even with diagonal loading. We're about 95% confident in this estimate.
BILLY Bookcase, white, 31 1/2x11x79 1/2 "
Box: 81¼″ × 11¾″ × 5″ · 88 lb 1 oz
Based on IKEA US (United States).
Package dimensions last checked and updated on Aug 06, 2026
Also on IKEA:United Kingdom
Package
Status
Limiting factor
Best orientation
Package #1
81¼″ × 11¾″ × 5″
Status:39⅞″ short
Limited by
Limiting factor:Opening width
Best orientation:Diagonal
Vehicle limits
Opening width / height
31⅛″ / 35⅜″
Cargo width / height
40⅛″ / 43¼″
Cargo length seats up / down
20⅞″ / 46⅛″
Loading sill height
27½″
Fiat 500 Cinquecento 2020
Measurements last checked and updated on Aug 11, 2026
Helpful tips
Use these loading tips to improve your chances of fitting BILLY Bookcase, white, 31 1/2x11x79 1/2 " in Fiat 500 Cinquecento 2020.
Optimize opening width
Keep the narrow edge leading while entering the opening.
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 Fiat 500 Cinquecento 2020
Ranked by fit margin and package-dimension similarity. This improves as we index more items.
About the Fiat 500 Cinquecento 2020 boot
The Fiat 500 Cinquecento 2020 carries a city-size trunk: the opening measures 31⅛″ wide × 35⅜″ tall, taller than it is wide, and the floor runs just 20⅞″ with the seats up. Fold the bench and it stretches to 46⅛″, a gain of 25¼″. Between the wheel arches you get 40⅛″, wider than the mouth itself, so every box must clear 31⅛″ first. The liftover sits 27½″ high with a 7⅞″ drop down to the floor. Groceries, duffels and one modest box ride fine; long flat-packs do not. Fold the seats before loading, and lower heavy boxes over the sill rather than dragging them.
About the BILLY Bookcase, white, 31 1/2x11x79 1/2 " package
The BILLY ships as one long, flat carton, 81¼″ × 11¾″ × 5″, and it is heavier than it looks at 88 lb 1 oz. The shape is the awkward part: long and only 5″ thick, a rigid panel box that will not bend or fold around a wheel arch. That length rules out most boots with the seats up. You want an estate, a hatchback with the rear seats folded, or an SUV that gives a flat run past the front seats. Two people make this easy. Carry it on edge, slide it in low, and rest the leading edge on something soft.
Frequently asked questions
Find quick answers about fit for BILLY Bookcase, white, 31 1/2x11x79 1/2 " in Fiat 500 Cinquecento 2020, including seats up vs seats down, limiting factor, best orientation, and package-by-package margins.
Will BILLY Bookcase, white, 31 1/2x11x79 1/2 " fit in Fiat 500 Cinquecento 2020?
No. With seats up, it is short by 39⅞″ at Opening width, even with diagonal loading.
What is the tightest part?
The limiting factor is Opening width, with -39⅞″ margin in seats up.
What should I do instead?
Use the Helpful tips & alternatives section to choose a smaller item, different orientation, or split-load plan.
Is the trunk opening the issue?
Yes. The tightest constraint is at the opening (Opening width) with -39⅞″ margin.
How tight is this fit?
This result is in the clear no-fit band (-39⅞″ at Opening width).
Does it fit with seats up or seats down?
Seats up: No (-39⅞″). Seats down: No (-28⅛″). Default selection follows YES > MAYBE > NO.
Why does it not fit?
The blocker is Opening width. The worst margin is -39⅞″ in seats up, so clearance is below the required buffer.
Can I load it diagonally?
Yes, diagonal is the best orientation for this check, with -39⅞″ around the limiting point.
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.