Will VÅGSTRANDA Pocket spring mattress, medium firm/white, Full fit in a Citroen Berlingo 2018?

Tall boxes suit the Citroen Berlingo 2018 boot. The opening is 39⅜″ high and 47¼″ wide, the same width as the floor at its narrowest, and the floor runs level with the loading sill. So a box under 39⅜″ tall never has to be laid down to get in. A long one may still have to sit at an angle across the floor. With the rear seats up you get 39″ of floor, enough for a few boxes next to each other. Laid flat lengthways, a box longer than 39″ needs the seats folded: that gives you 69¼″, a gain of 30¼″. Load the heaviest box first, over the 22½″ sill, and push it up against the seat backs.

In Full size, the VÅGSTRANDA mattress ships as one box of 58¾″ × 18¼″ × 17¼″, and it weighs 90 lb 3 oz. The box has no thin edge to grip, only broad, flat sides, and all of that weight sits in one compact block. Lying straight, it needs 58¾″ of boot floor, 18¼″ across it and 17¼″ of height. This is a lift for two people. Stand at opposite ends, hold the box from underneath, and lift together, so the weight never ends up in one person's arms.