a bottle carrier made of a foldable flat material , particularly cardboard , comprising a top wall , a bottom wall , side walls interconnecting the top wall and bottom wall at the sides , and a handle portion extending across the top wall and into two opposed side walls which is defined by weakening lines in the top wall and the side walls , has a strip - shaped central portion in the top wall and two fork - shaped end portions each of which extends into an adjoining side wall from the top wall and is joined to the side wall at the outer ends .