Packaging construction, said packaging construction defining a bottom side, a top side and a plurality of side panels joining said bottom side and said top side so as to form a closed structure, at least one edge being defined between adjacent side panels; said at least one edge being rounded; and said rounded edge having a radius which is between 10-150 mm; and wherein: said packaging construction is formed by multi-layer board material; said multi-layer board material comprises a corrugated middle layer, a first outer layer attached to the middle layer and a second outer layer attached to the middle layer; said corrugated middle layer being a corrugated layer comprising a number of peaks facing the second outer layer and a number of valleys facing the first outer layer; said second outer layer comprises sections between the peaks; and said first outer layer of said rounded edge displays a smooth and continuous radius without creasing, wherein: said second outer layer is made up of liner board; and said second outer layer has a lower bending stiffness according to ISO 5628 than the first outer layer and said second outer layer is buckled between each peak of said corrugated middle layer in the bent state of the board material but is not buckled between each peak in the flat state of the board material, each buckled section of the second outer layer exhibiting buckling according to Pk = 4 π 2 EI λ 2 such that such that said board is outwardly bendable to a radius which is between 10-150 mm only in a direction towards which the second layer faces in the sense that the outer layer of the board outward in the bend has a smooth continuous radius whereas the outer layer of the board inward in the bend is buckled, the bending stiffness of said second outer layer being chosen according to the equation E I s e c o n d o u t e r layer < SCT ⋅ λ 2 4 π 2, such that each section of the second outer layer of the multi-layer board material when subjected to bending in the bendable direction exhibits buckling, where EI second outer layer is the bending stiffness of the second outer layer, SCT is the second outer layer's compression strength according to the short-span compressive test according to ISO 9895, λ is the length between two peaks of the flutes of the middle layer of smoothly bendable board, and Pk is the buckling force required to buckle the second outer layer. said packaging construction is formed by multi-layer board material; said multi-layer board material comprises a corrugated middle layer, a first outer layer attached to the middle layer and a second outer layer attached to the middle layer; said corrugated middle layer being a corrugated layer comprising a number of peaks facing the second outer layer and a number of valleys facing the first outer layer; said second outer layer comprises sections between the peaks; and said first outer layer of said rounded edge displays a smooth and continuous radius without creasing, said second outer layer is made up of liner board; and said second outer layer has a lower bending stiffness according to ISO 5628 than the first outer layer and said second outer layer is buckled between each peak of said corrugated middle layer in the bent state of the board material but is not buckled between each peak in the flat state of the board material, each buckled section of the second outer layer exhibiting buckling according to Pk = 4 π 2 EI λ 2 such that such that said board is outwardly bendable to a radius which is between 10-150 mm only in a direction towards which the second layer faces in the sense that the outer layer of the board outward in the bend has a smooth continuous radius whereas the outer layer of the board inward in the bend is buckled, the bending stiffness of said second outer layer being chosen according to the equation E I s e c o n d o u t e r layer < SCT ⋅ λ 2 4 π 2, such that each section of the second outer layer of the multi-layer board material when subjected to bending in the bendable direction exhibits buckling, where EI second outer layer is the bending stiffness of the second outer layer, SCT is the second outer layer's compression strength according to the short-span compressive test according to ISO 9895, λ is the length between two peaks of the flutes of the middle layer of smoothly bendable board, and Pk is the buckling force required to buckle the second outer layer.