To benchmark the performance of the new parameterization of Martini 3 lipids, we conducted an extensive literature search for experimental reference data of bilayer geometric properties of area per lipid (APL), and three distinct thicknesses, namely the bilayer electron density peak-peak distance (DHH), the bilayer thickness (DB) also known as the Luzzati thickness, and the hydrophobic thickness of the lipid tail region of the bilayer (2Dc) . Such data can be obtained by scattering density profile (SDP) modeling, where the geometrical bilayer data is obtained from an MD simulation of a lipid bilayer, constrained by neutron and X-ray scattering data . The SDP model is considered a robust way to determine lipid areas and bilayer thicknesses, and it is often used for force field validation . We denote this collection of experimental data as the "Martini lipid Benchmark" (MlB) which contains data on APL, DHH, DB, and 2Dc for 29 lipid types at up to 4 temperatures with a total of 67 data points per property.