  Repulsive hadronic interactions play a relevant role in the QCD dynamics,
attractive ones being represented by resonance formation. In this study we
propose different schemes in order to parameterise repulsive interactions, then
being able to extract effective sizes of hadrons from fits to lattice QCD
simulations. We find that allowing a difference between the strange and light
sectors, strange particles are systematically smaller than light ones with
equal mass. The very simple implementation of repulsive interactions would in
principle allow to extract precise information about all hadronic species once
corresponding lattice observables, sensitive to the species of interest, are
provided. With the parameterisation which best reproduces lattice data there is
also a good description of experimental yields measured by ALICE and STAR
experiments.
