KALLAX Shelf unit, white, 16 3/8x57 5/8″
+16⅜″ margin
All items that fit an Audi A6 Avant 2024
Will fit in an ?
Maybe, it's a tight fit.
It might fit, but it's tight: BILLY Bookcase, black oak effect, 31 1/2x11x79 1/2″ is borderline diagonally in an Audi A6 Avant 2024 with seats down.
Fit Details
With seats down, It's close. This package fits on paper with 1⅛″ to spare at cargo length, best loaded diagonal. See the Helpful tips section below for practical loading suggestions. We're about 75% confident in this estimate.
BILLY Bookcase, black oak effect, 31 1/2x11x79 1/2″
Box: 81¼″ × 11¾″ × 5″ · 86 lb 15 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:+1⅛″, tight
Limited by
Limiting factor:Cargo length
Best orientation:Diagonal
Vehicle limits
Opening width / height above sill
41″ / 28″
Cargo width / height
39⅜″ / 28¾″
Cargo length seats up / down
46⅛″ / 77⅛″
Loading sill height
25¼″
Audi A6 Avant 2024
Measurements last checked and updated on Oct 21, 2026
Helpful tips
Use these loading tips to improve your chances of fitting BILLY Bookcase, black oak effect, 31 1/2x11x79 1/2″ in Audi A6 Avant 2024.
Use available cargo length
Push the package fully toward the seat backs to use all cargo length.
Load diagonally first
Load diagonally first, then straighten once inside.
Clear real-world obstacles
Clear the trunk before loading. Existing cargo, trunk cover, and wheel-arch bumps can reduce usable space.
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About the Audi A6 Avant 2024 boot
Length is easy in the A6 Avant. The floor runs 46⅛″ with the rear seats up and 77⅛″ with them folded, and it is 39⅜″ wide at its narrowest, so long flat packs and several boxes both have room. The tailgate opening measures 41″ across, with 28″ of clear height over the loading sill, and the boot is 28¾″ tall at the opening, measured from its floor, so it suits low, long boxes better than tall ones. The sill sits at 25¼″, and the floor is only ¾″ below it. Once a box is on the sill, push it in: there is barely a step to lower it down.
About the BILLY Bookcase, black oak effect, 31 1/2x11x79 1/2″ package
You get the black oak effect BILLY in a single box, 81¼″ long, 11¾″ wide and 5″ thick. It weighs 86 lb 15 oz, and over that length the weight is hard to control, so plan on two of you, one at each end. Lying straight, it needs 81¼″ of boot floor, though its width and thickness still matter. Lift together on a count, so neither of you takes the full weight, even for a second. Set it down the same way, both ends at once.
Frequently asked questions
Find quick answers about fit for BILLY Bookcase, black oak effect, 31 1/2x11x79 1/2″ in Audi A6 Avant 2024, including seats up vs seats down, limiting factor, best orientation, and package-by-package margins.
Will BILLY Bookcase, black oak effect, 31 1/2x11x79 1/2″ fit in Audi A6 Avant 2024?
Maybe. With seats down, it fits on paper with 1⅛″ to spare at Cargo length, less than the 2⅜″ a clear yes needs. Best orientation: diagonal.
What is the tightest part?
The limiting factor is Cargo length, with +1⅛″ margin in seats down.
What can I try to make it work?
Use diagonal loading and focus on cargo length. Push the package fully toward the seat backs to use all cargo length. Load diagonally first, then straighten once inside.
Can I load it diagonally?
Yes, diagonal is the best orientation for this check, with +1⅛″ around the limiting point.
Which loading orientation works best?
Diagonal is the best orientation for this result in seats down.
Does it fit with seats up or seats down?
Seats up: No (-18⅛″). Seats down: Maybe (+1⅛″). 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.
Do I need to fold the seats?
Results differ by configuration. Seats up is No and seats down is Maybe.
What could change the result in real life?
Cargo liners, wheel-arch bumps, the trunk cover, and items already in the trunk can reduce usable space. Measure the tightest point if the fit is close.
How tight is this fit?
This result is in the borderline band (+1⅛″ at Cargo length).