Will STRANDMON Wing chair, Nordvalla dark gray fit in a Mercedes Benz A-Class 2019?

A box needs to clear 37″ by 24⅜″ to get into the A-Class: the width of the tailgate opening and its clear height above the loading sill. That height is what holds back tall boxes. Inside, there is more room: the boot is 28¾″ tall from its floor, which sits 4⅜″ below the 25⅝″ sill, and the floor is 39″ at its narrowest. The floor is 32¼″ long until you fold the rear seats, which adds 27¼″ and gives long flat packs 59½″. Laid across the boot, a box can be at most 37″ long, the width of the opening. With the seats up, some longer ones still fit at an angle, on their side.

At 42½″ × 30½″ × 20″, the STRANDMON wing chair box is a bulky block rather than a flat pack, and it weighs 66 lb 8 oz. That bulk works against you: you cannot get your arms around it or hold it close while you walk. Lying flat, it needs 20″ of height and a patch of boot floor 42½″ by 30½″, with the long side either along the boot or across it. Make it a two-person job: take one side each, hands under the bottom edges, and lift and lower it together, so it never drops onto a corner.