A lattice packing member for gas-liquid contacting system comprising an odd number of plural longitudinal strips and an even number of plural lateral strips, the even number being one less the odd number of the longitudinal strips, wherein the longitudinal and lateral strips are crossed at right angles on their sides, the bottom of said longitudinal and lateral strips respectively is chamfered and has at least one projected area on which a notch is formed, a reinforcement with a flat bottom is provided at the center of lattice sections other than said sections with a projected area, the longitudinal strip located at the center of the latticed member coincides with the axial center line X of the lateral strip in the direction A of its length, a lateral strip constitutes the axial center line Y of the longitudinal strip in the direction B of its length which passes the center of the lateral lattice sections located at the center of the member, and said axial center lines X and Y intersect with each other at the center of the member.