We report on a Q-switched short-length fiber laser producing $100\mathrm{W}$ of average output power at $100\mathrm{kHz}$ repetition rate and pulse durations as short as $17\mathrm{ns}$ . Up to $2\mathrm{mJ}$ of energy and sub- $10\text{-}\mathrm{ns}$ pulse duration are extracted at lower repetition rates. This performance is obtained by employing a rod-type ytterbium-doped photonic crystal fiber with a $70\mu \mathrm{m}$ core as gain medium, allowing for very short pulse durations, high energy storage, and emission of a single-transverse-mode beam.