A blank for forming a package , the blank comprising: a set of side wall panels comprising a first, second, third and fourth side wall panel arranged consecutively one after another along a longitudinal direction (L) and foldably connected to each other along fold lines extending in a transverse direction (T), a first bottom panel foldably connected to the first side wall panel along a fold line extending in the longitudinal direction (L), a second bottom panel foldably connected to the third side wall panel along a fold line extending in the longitudinal direction (L), wherein the second bottom panel is configured to be positioned beneath the first bottom panel when the blank has been erected into a package , and two opposing side wall portions , each being foldably connected to a respective transversally extending side of the second bottom panel , and wherein the second bottom panel is configured such that, when the blank is erected into a package , the side wall portions are folded relative to the second bottom panel and form together with the respective second and fourth side wall panel two opposing double-walled side walls, characterized in that the first bottom panel comprises two internal, inclined fold lines , wherein each internal, inclined fold line extends along a direction having a major component in the transverse direction (T), and wherein each internal, inclined fold line extends from a transversally extending side of the first bottom panel to a free, longitudinally extending side of the first bottom panel , wherein each side wall portion comprises an internal, inclined fold line extending in a direction having a major component in the longitudinal direction (L), each internal, inclined fold line extending from a longitudinally extending side of the side wall portion opposing the set of side wall panels (101 - 104) to a respective free, transversally extending side of the respective side wall portion . a set of side wall panels comprising a first, second, third and fourth side wall panel arranged consecutively one after another along a longitudinal direction (L) and foldably connected to each other along fold lines extending in a transverse direction (T), a first bottom panel foldably connected to the first side wall panel along a fold line extending in the longitudinal direction (L), a second bottom panel foldably connected to the third side wall panel along a fold line extending in the longitudinal direction (L), wherein the second bottom panel is configured to be positioned beneath the first bottom panel when the blank has been erected into a package , and two opposing side wall portions , each being foldably connected to a respective transversally extending side of the second bottom panel , and wherein the second bottom panel is configured such that, when the blank is erected into a package , the side wall portions are folded relative to the second bottom panel and form together with the respective second and fourth side wall panel two opposing double-walled side walls, characterized in that the first bottom panel comprises two internal, inclined fold lines , wherein each internal, inclined fold line extends along a direction having a major component in the transverse direction (T), and wherein each internal, inclined fold line extends from a transversally extending side of the first bottom panel to a free, longitudinally extending side of the first bottom panel , wherein each side wall portion comprises an internal, inclined fold line extending in a direction having a major component in the longitudinal direction (L), each internal, inclined fold line extending from a longitudinally extending side of the side wall portion opposing the set of side wall panels (101 - 104) to a respective free, transversally extending side of the respective side wall portion . <EOS>