  The unified set of yields of particles produced in proton-proton collisions
at $\sqrt{s}$ = 17.3 GeV (laboratory beam momentum 158 GeV/c) is evaluated,
combining the experimental results of the NA49 and NA61/SHINE collaborations at
the CERN SPS. With the statistical hadronization code Thermal-Fist we confirm
the unacceptably high value of $\chi^2$, both in the canonical and grand
canonical - strangeness canonical approach, and the common volume for all the
hadrons. The use of the energy-dependent width of the Breit-Wigner
parametrization for the mass distributions of unstable particles improves the
quality of the description of particle yields only slightly. We confirm the
observation that exclusion of the $\phi$ meson yield makes the fit result
acceptable. The complete experimental data set of particle yields can be
reasonably fitted if the canonical volumes of hadrons without and with open
strangeness are allowed to vary independently. The canonical volume of
strangeness was found larger than that for non-strange hadrons, which is
compatible with the femtoscopy measurements of p+p system at $\sqrt{s} = $ 27.4
MeV and 900 MeV. The model with the best-fit parameters allows to predict the
yields of several not yet measured particles emitted from p+p at $\sqrt{s}$ =
17.3 GeV.
