Will BILLY Bookcase, oak effect, 31 1/2x11x79 1/2 " fit in an Audi A4 Avant 2022?

The A4 Avant pairs a wide mouth with real height: the opening measures 40⅛″ across and 33½″ tall, so upright boxes pass through without a tilt. The floor gives you 41⅜″ with the rear seats up and 72″ once they fold, a gain of 30¾″, with 39″ between the wheel arches at the tightest point. The lift-over sits at 24¾″ and the floor is only 2″ below it, almost level, so long boxes slide in instead of dropping in. Tall furniture cartons and long flat packs both do well here; extra-wide boxes meet the 39″ pinch first. Slide heavy loads across the sill on a blanket rather than lifting them over.

The BILLY bookcase ships as one long, flat, heavy box: 81¼″ × 11¾″ × 5″ and 87 lb 5 oz. The length is the challenge, not the bulk. That long panel needs floor space most boots only find with the rear seats down. The flat-pack board is rigid, so it will not bend around a wheel arch or curl into a short boot. An estate, a hatchback with the seats folded, or an SUV handles it best. Slide it in long-edge first, low and flat, and protect the corners, because at this weight a dropped end can split the board.