We demonstrate generation of hyperentangled (time-bin and polarization) photon pairs via four-wave mixing in a microstructure-fiber Sagnac interferometer. The two-photon interference visibility in the time-bin (polarization) degree of freedom is 88% +/- 2% (84% +/- 1 %) without subtraction of accidental coincidences, and Bell s inequality is violated by 27 standard deviations at a 1 kHz coincidence rate.